IF in Yuletide 2017

[prosodiical]

I'm posting this since the usual people haven't! This is copy-pasted from the excellent posts last year and the year before (2016, 2015). Any new errors are mine.

raininshadows has also made a spreadsheet of requests!

Are you interested in text adventures, CYOA, twine games or other sorts of interactive fiction? Do you want to let your writer know you'd be happy to receive something along those lines? Are you looking for someone to write IF for? This post is for you.

What is IF?
Interactive Fiction (IF) covers everything from text adventures through to visual novels, by way of all sorts of experimental works. It can be mostly a game, or mostly a story; it can be a way to immerse the reader, or to play around with the concepts of storyteller and audience; it can be an exploration of chance, or of fate; it can be a straightforward story, or something else entirely. From Healy's post:

[IF] is a term used for games which are made up primarily of text, like Adventure, Zork, Hitchhiker's Guide to the Galaxy, and other text adventures, or more experimental hypertext works like My Father's Long, Long Legs, or even visual novels. Interactive fiction these days is generally divided into two groups based on how you interact with the game: parser-based IF, and choice-based IF.

Parser-based IF, more commonly known as text adventures, are controlled by typed in commands, like "GET KEY", "OPEN DOOR", "GO NORTH", "LOOK UNDER BED", and stuff like that. Not every command you type in will work, though, so they're hard to get used to if you haven't tried them before. To make things easier, here's a card of most of the common commands. Some good parser-based IF to try first would be Ryan Veeder's So, You've Never Played a Text Adventure Before, Huh?, Admiral Jota's Lost Pig, Andrew Plotkin's The Dreamhold, and Adam Cadre's Photopia.

Choice-based IF is simpler; you just pick from a number of options. This can be done through hyperlinks and other clicky selections, though more rarely you may have to type a number from a list. Good examples of choice-based IF include Anna Anthropy's Star Court, Alan DeNiro's Solarium, the various games hosted by Choice of Games, and most every given visual novel.

Writing IF for Yuletide
IF is considered opt-in for Yuletide - please don't write it for people who don't want it. If you aren't sure whether it would be welcome or not, ask a mod to check with the intended recipient.

You are still required to follow the normal rules, such as focusing on requested characters (unless the recipient has said you needn't include them all).

If you're writing a treat, unless you're sure your recipient would be happy with it as a main gift, either post it to Madness or wait till they have another full-length gift posted.

It can be hard to figure out what word count an IF story really is - what you've written is full of code that doesn't count, and what your recipient sees may vary in length depending on their choices. If you're posting to the main collection, try to overshoot the minimum requirement a bit, just to be on the safe side. Say a minimum of somewhere between 2,000 and 4,000 words. Or probably about 10 to 15 minutes play through.

If your post to the main AO3 collection is under 1,000 words (e.g. you're just linking to an online playable version elsewhere), please drop the mods a note so they know it isn't someone posting something under the minimum, and provide them with an estimated word-count.

Your recipient does need to be able to access what you've created! Please link to a suitable IF interpreter if required, or if possible make a web-playable version.


Requesting IF for Yuletide
If you would be happy to receive IF this year, please leave a comment below, following this template:

AO3 username:
Letter link:
Fandoms you would like IF for:
Anything else: (optional - the sort of things you love about IF, specific IF prompts and preferences etc)


Some IF Tools
This is from Healy's and quillori's lists from previous years. A * means they can make web-based games.

Parser-based
Inform*: One of the biggest development tools for making parser-based IF. Has an English-like code. Available for Windows, Mac, and Linux.
Quest*: Another big IF development tool. Has a click-and-point editor with the option to check out the code. For Windows and web.
TADS*: A long running engine for writing interactive fiction, though generally not as easy to use as Inform. The latest version can make web-based games, although they need to be hosted on a non-https address or on the IFDB.

Choice-based
Twine*: Very popular tool for making choice-based IF. Has a visual editor, with some code-y bits for variables and the like. Can be extended with some Javascript passages. Available for Mac and Windows, and Twine 2 is web-based. See this comment for more notes.
ChoiceScript*: Used by the fine folks over at Choice of Games. Uses simplified Javascript to make games. It's very stat heavy. Requires a text editor. See this comment for notes.
Ren'py: Engine for making visual novels. Uses a simple scripting language. Available for Windows, Mac, and Linux, and can make games for all those platforms.
Inklewriter*: A completely web-based engine for making CYOA-style games.

Comments

Queries, Corrections, Suggestions

[prosodiical]

Please reply to this comment if you have anything you'd like me to add here, if any links are broken, if there are any new IF tools I should add, etc.

[isis]

AO3 username: Isis (Isis)
Letter link: https://isis.dreamwidth.org/179972.html
Fandoms you would like IF for: Any
Anything else: I'd especially be interested in IF for the post-canon prompt for The Chrysalids (Michael's journey to rescue Rachel, and their journey to Zealand), as I think it lends itself to a CYOA type of story.

(I'm requesting The Bedlam Stacks – Natasha Pulley, The Chrysalids – John Wyndham, Magnus Chase and the Gods of Asgard – Rick Riordan, Plus One – Elizabeth Fama, and Wiedźmin | The Witcher (Video Game).)

[muccamukk]

AO3 username: Muccamukk
Letter link: https://muccamukk.dreamwidth.org/1114537.html
Fandoms you would like IF for: Guns of Navarone, The Murderbot Diaries, The Reckoning, Sinbad (2012), Twelve O'Clock High.
Anything else: I've never received IF before, and am interested in all possibilities. I should note that I don't have the bandwidth for extensive streaming video or audio elements, unless I can download them separately.

I like the idea of found documents and competing textual versions of stories, if that could be worked in. I like things that are spooky and show shifting realities. Or odd/outsider points of view, like a worm program trying to take over Murderbot's head, or a member of Cook's family interacting with the Sinbad crew.

I'm fine with any rating and point of view.

[yhlee]

AO3 username: yhlee (etothey)
Letter link: https://yhlee.dreamwidth.org/2396434.html
Fandoms you would like IF for: Legend of the Five Rings (LCG), Steve Jackson's Sorcery! - Steve Jackson, Vorkosigan Saga - Lois McMaster Bujold

Anything else: I'm familiar with gamebook formats, choice-based/CYOA, and parser IF; of the platforms listed in the masterpost here, the only one I haven't played games in is Inklewriter, and I'd be happy to figure it out. :)

I am comfortable with second person (or any person, really) and unusual formats in general. Choice of protagonist/"adventurer"--whether one of the requested characters, or another character's perspective, or an OC--is completely up to you. I'm fine with any rating, and I am fine with character death (although I also like happy endings).

General prompts: I love the idea of exploring what-if's in a canon-divergence sort of way, of characters matching wits against each other. I'd also be tickled by a more meta "historical" look at the requested characters, or worldbuilding, by historians or archaeologists or folklorists coming to their stories after the fact. Worldbuilding in general would be welcome, especially related to celebrations (e.g. Winterfair for Vorkosigan, or New Year's or, say, the Emperor's birthday for Legend of the Five Ring). I would be perfectly happy with a game where I got to wander around "looking" at all the pretty surroundings and playing with interestingly described objects. :)

Legend of the Five Rings: If you're familiar with Emily Short's parser-based IF Pytho's Mask (or even if not), I think a romance/intrigue court romp along those lines could be a lot of fun for this fandom. The two characters I requested are in a canon lesbian relationship that is also an extramarital affair, so there's lots of potential for drama. I'm happy with both tragic and happy endings, and a variety of possible outcomes could be really interesting.

Steve Jackson's Sorcery!: This one actually is a gamebook series and, besides the general ideas above, anything in the style of the canon would be lovely. I'd also be tickled by an IF from the viewpoint of one of the Adventurer's adversaries, e.g. the Archmage of Mampang.

Vorkosigan Saga: Messy politics would be very interesting here, or else various Vorkosiverse what-if's extending as far down the timeline as you like, or an exploration of Aral and Ges's complicated and messy relationship (or heck, pure CYOA smut if you're up for that). In particular, looking at how these two characters' maneuvers affect the people around them would be interesting.

[rosehiptea]

AO3 username: TeaRoses
Letter link: https://rosehiptea.dreamwidth.org/270995.html
Fandoms you would like IF for: Jordskott/Any
Anything Else: Jordskott seems to me like it could work well for IF. Some sort of small adventure involving Ylva and/or Muns, or other characters or even OCs as I said in my letter. My other fandoms don't seem to lend themselves to IF as much this year but if you disagree and really want to write IF for another fandom I requested I will be more than happy to accept it. Please feel free to use any kind of IF that works for you. I will be happy to figure out how it works.

[rocknroll1968]

AO3 username: The_Anglophile
Letter link: https://the-anglophile.dreamwidth.org/13580.html
Fandoms you would like IF for: Any!
Jeff Buckley (music RPF)
Oasis (music RPF)
The Verve (music RPF)

Anything else:
I would be thrilled with any style IF gift. I love CYOA, and have ventured into parser games a little bit and thought they were great. I love the possibility of alternative endings based on choices, and especially love the ability of CYOA to allow for AUs, canon-compliance, and crack all within one story. E.g. Do I reply to the talking frog, ignore her because talking frogs don't exist, or take her up on her offer to buy me a swampwater cocktail at the Frog Bar?

Feel free to get extremely meta or out-there with it. I love this medium for experimental writing. In contradiction of my DNWs, I am just fine with 2nd person POV for IF.

A few ideas:

"You're the new roadie for the band! They need you to XYZ or the next show will be a disaster!"

Alternate endings AU for Jeff Buckley (where he has the chance to live).

I've never seen it done, but interactive porny slashfic could be fun.

Magical or supernatural AUs: vampire, werewolf, Lovecraftian, etc. Humour or crack might work well with this.

Weird POVs: "You're a guitar!", "You're a live music venue!", "You're a pigeon in NYC!"

[kutsutsu]

AO3 username: kutsushita
Letter link: https://kutsutsu.dreamwidth.org/1101.html
Fandoms you would like IF for: I requested 19th Century American Medicine RPF, Chihayafuru, The Folly of the World, Mob Psycho 100, Namco High, and Ookiku Furikabutte. I feel like Namco High is best suited to IF since it is a visual novel canon itself, but I am open to all of them!
Anything else: I'm maybe more fond of CYOA and other choice-based IF than parser-based but I am open to whatever! Also good with any rating, POV, any kind of smut, bad or good endings, etc.

Some ideas:

The Folly of the World: It's a weird horror canon with a lot of unreliable memories and people coming back from the dead and maybe people going mad, so might be suited to something that plays on that, perhaps with an uncertainty of the true reality?

Namco High: Could be something dating game ish like the canon itself, or something meta poking at the for mat of the game? I also really live time loops which work well here since Davesprite's canonical experiencing one.

[prosodiical]

AO3 username: prosodiical
Letter link: https://prosodiical.dreamwidth.org/1773.html
Fandoms you would like IF for: Any! (Aoi Shiro, Hustle Cat, Shin Megami Tensei: Devil Survivor, Oxenfree)
Anything else: I'd be delighted by choice- or parser-based IF! Also, I'm up for any POV, multiple endings or a single click-through story, whatever you'd like to do with the medium, really.

Some ideas:
Aoi Shiro - I'd love some interesting canon-divergence AUs, or post-game shenanigans - Syouko dealing with Kaya back in her life, or has to jump through hoops to join the Suten, or whatever Kohaku was up to in that time?

Hustle Cat - I feel like a mini-case would be delightful in an IF format; Avery trying to learn to use their magic, Graves having to step in if they fail! Or plans for a Valentine's date gone spectactularly well (or wrong).

SMT: Devil Survivor - Protag enlists Naoya's help after any route with varying results, or post-Law or Chaos he has more trouble with angels and has to decide how to deal with it? The weirdness of being in the real world again and dealing with the aftermath?

Oxenfree - The canonical time-weirdness would be amazing in IF - Alex finding her world falling apart at the seams! Is she able to recruit Jonas or Michael or anyone else to help her get out? I'm down for all manners of bad ends and creepiness and timeloops and whatever else here.

[quillori]

AO3 username: Quillori
Letter link: DW Letter
Fandoms you would like IF for:
Le città invisibili | Invisible Cities - Italo Calvino
Táng Cháo | Tang Dynasty RPF
Omar Rayyan - Works
Liáo zhâi zhì yì | Strange Tales from a Chinese Studio - Pú Sônglíng

Anything else: I find IF fascinating, so I'm pretty much guaranteed to love whatever you do - if you want to do something I don't mention, the very fact I didn't think of it means I'll be interested to read it. So these prompts are only suggestions, not in any way requirements.

I have far more experience with choice based than parser based games, but I'm open to either. I'm all mac though, so web based or works on a mac, please.

For Invisible Cities, I would have thought Euphemia, with its trade in memories, offers some fascinating IF possibilities - for example, normally in-game choices affect what happens in the future; how would it work if they reflect what you remember of the past? Or a story pieced together from many fragments of memories. Or something else entirely!

Berenice's intrigue and intricately nested stories offers a different type of inspiration, with its informers and hidden communities.

Tang Dynasty RPF: It's the imagery here I'm interested in, and I'm not sure how that would translate to a traditional IF story, but perhaps after all it would be possible to use IF to create the sort of phantasmagorical world I'm interested in, where the reality of demons and ghosts and spirits always underlies the 'real' world of humans.

Worldbuilding for Spanish Mackerel (Omar Rayyan) would be very welcome, in whatever form you want.

Very much the same elements appear again and again in Strange Tales - the scholars and the monks and the beautiful women, the ghosts and the foxes and the demons - but the outcomes and the characters of the participants changes radically from story to story.

(I haven't included The Reluctant Widow - Georgette Heyer and Kitaab 'alf layla wa-layla | One Thousand and One Nights in the list of fandoms I'd like IF for, because my fairly character focussed requests this year (for Francis Cheviot and Ja'far respectively) seem to me more suited for a more conventional, non-IF story, but if I'm wrong about that, and you see the perfect way to write one of those requests as IF, go ahead.)

[shootingstarrrz]

AO3 username: falsteloj
Letter link: https://shootingstarrrz.dreamwidth.org/3774.html
Fandoms you would like IF for:
☆ Algie the Miner - Algie, Jim.
☆ The Aliens (2016) - Dominic, Lewis Garvey.
☆ Southland - John Cooper, Ben Sherman.
☆ Whitechapel - Joseph Chandler, Emerson Kent.
☆ Y Gwyll | Hinterland - Lloyd Elis.
Anything else: None of the above are traditional IF fandoms but I love all kinds of fic formats and had already explicitly mentioned it in my letter, so it made sense to post here too. :) I've no DNWs, but my general likes and fandom prompts are all listed in my letter. I'm more than fine with any rating, pov, tropey weirdness, etc, etc.

[eluviaa]

AO3 username: Eluvia
Letter link: https://eluviaa.dreamwidth.org/927.html
Fandoms you would like IF for: Any (17776: What Football Will Look Like in the Future - Jon Bois, 1931: Scheherazade at the Library of Pergamum, Mysterious Mr. Quin - Agatha Christie

Anything else: I love this medium so much and am totally fine with parser- or choice-based IF. I'm down for any rating, POV, and type of story. (I do have a few DNWs in my letter but otherwise, carte blanche!)

Some ideas:

17776 -- There's so much potential here for all kinds of weird, wonderful IF stories that I don't even know where to start! Strange space happenings, or the probes playing some bizarre IF game that got popular for a while six thousand years ago, maybe.

1931 -- Sadie and Sterling on a small side-caper, possibly set just post-canon after everything's gone to shit.

Mysterious Mr Quin -- Quin and Satterthwaite solving a mystery, or perhaps Satterthwaite solving the mystery that IS Quin.

[weakinteraction]

AO3 username: weakinteraction
Letter link: here
Fandoms you would like IF for:

Sid Meier's Alpha Centauri
Age of Apocalypse (Comics)
Star Trek: Discovery
Star Wars: Darth Vader (Comics)
Garth Marenghi's Darkplace
Look What You Made Me Do - Taylor Swift (Music Video)

Anything else:

I am equally happy with both parser-based and CYOA IF. I'm happy for it to land anywhere on the various axes of "game" vs "simulation" vs "story"; I do enjoy puzzles, as long as they aren't insanely difficult to work out. On the more story-ish end, I do enjoy it when there isn't an obvious "good ending", or at least where it's left open to interpretation whether any particular ending is good or not. On the fanworks end, I do enjoy little details in how things are presented that call back to canon, if that makes sense (e.g. making the interface look like something in-universe), though I realise that's very tricky so it's very much an optional extra!

[tristesses]

AO3 username: tristesses
Letter link: https://tristesses.dreamwidth.org/47062.html?style=site
Fandoms you would like IF for: My Best Friend's Exorcism; Queen of the Tearling; Summertime Sadness - Lana Del Rey (Song); We Have Always Lived in the Castle
Anything else: I love CYOA-type games, or games that explore a number of different AUs, different POVs, epistolary fic, generally using the format to expand the story you would tell if you were limited to a standard short story format. I also really like IF when used as experimental storytelling - playing with non-linear time, breaking the fourth wall, examining what counts as a story and what doesn't, so if you're into that sort of thing, go wild. Any tense, any POV (first, second, third are all cool with me).

I am more familiar with choice-based IF, but I'd really be into parser-based IF if that's what you like to write! (Just...please provide me with a playthrough, I'm so bad at guessing commands for those.)

Anyway, fandom-related ideas...

My Best Friend's Exorcism: something where you experience the same events from various POVs - Gretchen's and the demon's are what I'd be most interested in, just because of the potential for using the format to sort of make Gretchen's experiences bizarre and unstable and make the demon more alien.

Queen of the Tearling: Various AUs where Kelsea makes a different decision at the end. This is one of my favorite genres of IF - exploring what-ifs and could-have-beens.

Summertime Sadness: We see the events unfold from Lana's POV, but what about the other woman? What choices led to her eventual ending?

We Have Always Lived in the Castle: Not to harp on the same theme, but AUs where Constance and Merricat make different decisions than in canon and their repercussions.

These are all just jumping-off points; I'm not very good at thinking up prompts for IF. I love it as a genre, though, so anything you'd be interested in writing, I'm interested in reading/playing!

[zoi_no_miko]

AO3 Handle:zoi_no_miko
Letter Link: on Livejournal!
Fandom: Dark City! The movie's so -weird-, can you imagine how interesting IF could be, mucking with all those identities? I'm also okay with an "ANY" character in an IF fill if you want to go hard on worldbuilding type fic (though I think it would be a miss not to use Doctor Schreber.)

[straightforwardly]

AO3 username: straightforwardly
Letter link: here
Fandoms you would like IF for: Any of them! My requested fandoms are Child of Light, Gokusen, A Little Lily Princess, and Shall We Date? The Niflheim. See my letter for who my requested characters are.
Anything else: I adore choice-based IF! (As might be suggested by the fact that half of my requested fandoms are visual novels.) I'm kind of laughably terrible at parser-based IF, but I'm still open to receiving them too. It's just that in that case, I'll probably need some help to find my way to the end.

I'm going to leave a few prompt suggestions below, but feel free to ignore them! Anything based on the prompts in my letter, my general likes, or just anything you think I might be into would also be very welcome!

Child of Light - Maybe something based off of my Aurora and Norah prompts? A choice-based game going through a post-game conversation they might have, or something about a not-as-dead-as-they-thought Norah making her way to Aurora's castle?

Gokusen - Maybe something based off of my "Shin, or Shin & Yankumi get kidnapped" prompts, where Yankumi goes off to rescue him or they both need to figure out how to break out? Or, the idea of Shin having a Terrible, Horrible, No Good, Very Bad Day kind of makes me laugh, so something with that?

A Little Lily Princess - I have no IF-specific ideas for this one, but I would still love to see what someone else could come up with!

Shall We Date? The Niflheim - Maybe something following one of my requested characters throughout the course of a festival of some sort? With all the weird / sweet / oddly creepy / romantic / adventurous / whatever encounters they might have along the way?

[keerawa]

AO3 username: keerawa
Letter link: https://keerawa.dreamwidth.org/715.html
Fandoms you would like IF for: A Taste of Honey - Kai Ashante Wilson

This is a m/m fantasy/sci-fi novella with a non-linear narrative style and canonical multiple timelines that make it ideal for IF. I have one prompt specifically looking for IF.

The monstrous Sybil's fragmented view of the many future possibilities and probabilities as she sends Lucrio to Olorum to meet his love, anticipating his bitter tears, but welcome IF takes on other prompts in this fandom.

Although I listed unhappy endings as a DNW in this fandom, IF would be an exception. Some of the potential endings can and should be be dark and unhappy.

[shadowsapiens]

AO3 username: shadow_lover
Letter link: https://shadow-lover.dreamwidth.org/7671.html

Fandoms you would like IF for:
The Legend of Zelda:Breath of the Wild
Karneval
Night Sun Tarot Deck
The Royal Tutor
Shadowscapes Tarot
Togainu no Chi

[(Anonymous)]

AO3 username: skazka
Letter link: https://skazka.dreamwidth.org/165965.html
Fandoms you would like IF for: An American Werewolf In London, Assassination of Jesse James by the Coward Robert Ford, Dark City, Dark Tower - Stephen King, Philip Marlowe - Raymond Chandler, We Were Liars - E. Lockhart
Anything else: I love the way IF's various formats help structure the suspenseful or mysterious aspects of a story, as well as just the interface itself. I'm not great at especially baroque puzzles, but I'm absolutely equally interested in something that's focused on atmosphere and a gradually unfolding narrative as something with a lot of plot going on.

For Dark Tower, I'd love fic exploring old Gilead or any of Mid-World's spooky blasted spaces (wastelands, deserts, etc.). Maybe something like the Randall Flagg version of Varicella (https://en.wikipedia.org/wiki/Varicella_(video_game)), where You Are A Treacherous Advisor and your objective is to steamroll all obstacles between yourself and your objective? Or any glimpse into creepy dream visions.

For Marlowe fic, IF seems really suited to unraveling a mystery, or indulging in some big-time hardboiled narrator pastiching.

For We Were Liars, maybe an IF experience involving exploring the island, or mapping out the incursion of Cadence/Gat's memories of past summers onto their present-day experience? Alternately, ghosts.

(I don't have any individual prompts for Dark City, An American Werewolf in London, or AOJJ off the top of my head but I'd love to read IF for either/both of them!)

[scribblemyname]

AO3 username: scribblemyname

Letter link: http://log.lianamir.com/2017/09/26/yuletide-2017-exchange-letter

Fandoms you would like IF for:
To Kiss the Granite Choir - Michael Anthony Ashley
And Her Eyes Sewn Shut with Unicorn Hair — Rosamund Hodge
Scry - Anne Ivy

Anything else:

I’ve recently become more interested in interactive fiction and especially love it for science fiction/fantasy, where there are worldbuilding reveals or different character interactions and dialogue or completely different outcomes lurking behind each choice. I like both plot-driven story pieces and pure discovery ones where it’s just a puzzle to figure out the answer to a question. All of these fandoms left me with questions of the best kind.

I like it when the same story could come with a good or a bad outcome or several ambiguous ones. I’m actually a huge fan of happily ever after fluff, hurts so good intense angst/tragedy, and also realistically a mixed bag that nevertheless is satisfying for one or more of the characters. You can mix and match potential endings or go all one way or the other in tone.

I would love to see what you come up with if you want to do something for any of these fandoms. Mostly, I’m intrigued by all the directions some of them can go and think they would fit the form well. There are a lot of pivotal moments are decisions that seem to happen off-screen in these stories, hints of might-have-beens and what-ifs, different kinds of paths that could occur post-canon, all potentially intriguing to explore.

I’m on a Windows computer and am open to all tenses and persons.

Some Actual Prompts, linked due to length

[ceb]

AO3 username: molybdomantic
Letter link: https://ceb.dreamwidth.org/373604.html
Fandoms you would like IF for:
Powerpuff Girls
The Order of the Stick
Spambots (Anthropomorphic)
Agricola (Board Game)
Tales from the Kingdom of Fife - Gloryhammer (Album)

Anything else:
I grew up on CYOA books and Fighting Fantasy and have a very big soft spot for trad parser text adventures (think Curses, Hitch-hiker's Guide, Zork). I'm less of fan of modern choice-based games. Recently I've been very taken by even very linear stories told via an IF parser or other multi-media means - there was a surprisingly effective entry in last year's IFcomp (sorry, I can't recall the name) that was completely linear but used the parser to change backgrounds &c. according to the mood of the writing.

[lirin_lirilla]

AO3 username: lirin
Letter link: https://lirin-lirilla.dreamwidth.org/19576.html
Fandoms you would like IF for: Epistory - Typing Chronicles (Video Game), Something I Must Do (Woot T-Shirt), Yarnia: The Grand Quest Blanket (Knitting Pattern), Oxford Time Travel Universe - Connie Willis, The Scarlet Pimpernel - Baroness Orczy
Anything else: I'm not very good at playing parser-based IF; I'm totally up for giving it a try, but please don't make it super difficult! As regards choice-based/CYOA, I'll soften my character death DNW: as long as one ending (that I can pretend in my head is the "real" ending) doesn't contain non-canonical major character death, you can include it in the rest of the story.

A few non-comprehensive possibilities for each of the fandoms:

Epistory - Perhaps some snippet of the canonical adventures but with the fox—or one of the creepy-crawlies, or an unseen observer, or whoever—as the protagonist? Feel free to require lots of typing, since this is originally a typing game...or play in any way with the interaction and overlap between words and pictures that is a bit of a theme in the game. For a CYOA, perhaps something where the protagonist doesn't always successfully escape the origami world.
Something I Must Do - Adventures of the explorer fishie! Or stressed-out waiting at home for news on the part of the fish in the water! Feel free to kill off the explorer fish (or both, or destroy the entire world) in all but one ending because I totally don't mind them having a really hard time of things as long as they have a chance at succeeding.
Yarnia - Perhaps taking part of the actual story and giving it other options of ways it could have gone...or centering around a different character and playing with the world of Yarnia without touching on any of the canonical adventures. (Perhaps another adventurer shows up in the Sheepkin's house, after the protagonist of the Yarnia pattern leaves.) Or just exploring one of the Yarnia locations in a parser-based IF. I'm so intrigued by the little glimpses this knitting pattern gave of the world of Yarnia that I want to get some more glimpses of it. :-)
Oxford Time Travel Universe - I'm not sure how well the prompt in my letter would work for IF, but you could also go earlier and have the adventures of Colin looking for & trying to rescue Polly et al. Parser-based...it would be cool to play as Colin and go through random newspaper articles trying to find which ones have significance. Or choice-based...those stuck in the future (including Colin) hit a lot of dead ends in trying to rescue their friends in the past, so perhaps something where you play as one of them but your choices almost never pan out.
Scarlet Pimpernel - Perhaps something involving the spread of gossip, as characters either ignore or spread their knowledge of Marguerite's and Andrew's compromising behavior. Or a traditional Pimpernel rescue that Marguerite and/or Andrew are involved in.

[jaclynhyde]

AO3 username: jaclynhyde
Letter link: Here!
Fandoms you would like IF for: Any (Final Fantasy IV, Final Fantasy V, Nier, Quadrail Series - Timothy Zahn)
Anything else: I have prompts for FFV and Nier IF specifically, but if you can make it work for anything else, I'd love it! My prompts:

*FFV: Meta interactive fiction--if you want to write IF, I'm sure Gilgamesh would have something to say about it. This could work with any of the above prompts or something different (Gilgamesh searching for swords? Trying every route of a dating sim to find Bartz? Meta elements in any of the other prompts are great, too, especially if you throw in something about jobs or the Four Job Fiesta.
*Nier: If you're into writing interactive fiction or meta fic, another adventure in the Forest of Myth would fit in quite well! I was really amused by how little Weiss liked being in a world of words, and also by Nier's caliber of problem-solving skills. Any scenario where they revisit the Forest, or get to visit some more dreams, would be great. What if they visited each others' dreams/nightmares (and Nier realizes that Weiss has them at all)?

And copying from the above comment, character death is not a DNW for bad endings if there are multiple endings.

[reconditarmonia]

AO3 username: reconditarmonia
Letter: http://reconditarmonia.tumblr.com/post/166165959651/dear-yuletide-writer
Fandoms you would like IF for: Simoun (anime)
Anything else: I love IF where the format is really productive to the worldbuilding or story - "Counterfeit Monkey" is the gold standard for parser-based IF that uses its medium productively, which, free rec if you don't already know it, but really any IF story that "needs" to be IF and wouldn't work, or work as well, in another medium is my jam.

It didn't even occur to me to request IF until I learned about this post/challenge, so the extent of my IF request in the post is "didn't even think about this, but it'd be great for this fandom." Simoun, if you don't know it, is an anime series about a group of young women who pilot magical aircraft in pairs. In the setting, these aircraft are used for devotional shape-making purposes and the women are priestesses, but they are effectively made over into an airforce because of the battle power of these shapes, and the series is partly about the tension of whether or not they're soldiers in a war. Also, everyone is female up until they come of age, at which point they choose a permanent sex! And and and there's weird time stuff and other-dimension stuff. Basically, there's some IF potential here, if you're into it.

[dhampyresa]

AO3 username: sevenofspade
Letter link: https://dhampyresa.dreamwidth.org/195347.html
Fandoms you would like IF for: Campaign (Podcast), Cleverman, Locke & Key, Marvel Secret Wars Battleworlds, Punic Wars RPF, Unbelievable Gwenpool
Anything else: I prefer browser-based games and games where you have to click rather than type. Other than that, anything goes!

[gogollescent]

AO3 username: gogollescent
Letter link: https://gogollescent.dreamwidth.org/4159.html
Fandoms you would like IF for: 80 Days, 7 Seeds, Friends at the Table
Anything else: I'm especially fond of and familiar with parser IF, though Twine is also awesome!

[meteordust]

AO3 username: Serenade
Letter link: https://meteordust.dreamwidth.org/177905.html
Fandoms you would like IF for: Falcon, The Book of Isle, Chronicles of Amber
Anything else: I love all kinds of IF!

[prinzenhasserin]

AO3 username: Prinzenhasserin
Letter link: http://prinzenhasserin.tumblr.com/post/165862424655/yuletide
Fandoms you would like IF for: Any! (That is, RED, Gokusen, British Romantic Writers RPF, Roundtable Rivals, Miss Marple, Island of the Aunts)
Anything else: I like choice-based IF, and I love puzzles, or multiple story-lines leading to the same or a completely different ending; but I also like parser-based games!

[reeby10]

AO3 username: reeby10
Letter link: https://reeby10.livejournal.com/109021.html
Fandoms you would like IF for:
- Dinotopia - James Gurney
- A Knights Tale
- Midnight, Texas (TV)
- Peter Pan - J.M. Barrie
- Power Rangers (2017)
- Stranger Things
Anything else: Any kind of IF is great! I think a creepy, atmospheric IF would be awesome for Stranger Things, or even Peter Pan or Midnight, Texas. I'm... not exactly sure how IF would be with some of the others, but I'm up for anything :)