HI. HELLO. sorry this took two months lmao BUT i have a few! my fiance loves ivan, he's one of his favorites, and while i don't have too many headcanons about him yet, there's a couple i can share!

note that these apply almost solely to my fic universes, mostly to BSPverse (next gen verse), aside from the first one. do not take this as like, how i think he is in canon lmao

• fyodor absolutely did not give him a lobotomy first and foremost idc what canon says, usually i'm okay with medical inaccuracies to a degree but not when it's procedures that aren't understood at all to start with by most of the general public, AND have been used as a tool for oppression, just to explain why i'm so hardline about this. anyway what he effectively did was brainwash ivan into believing he'd done it using a lot of cult brainwashing tactics and not like, an ability, as some have theorized (bc fyodor would need someone else to do that given his ability can't do that, and let's be honest, i don't think he'd do that for such a delicate situation requiring ivan to trust him and only him)
• he's nonbinary transmasc and gay
• in BSPverse, he and fyodor are one of only a handful of couples who are married before the series officially starts (atsushi acquisition, which in BSPverse, takes place in 1999). they got married because ivan wanted fyodor to "take all of him" aka wanted to fuck and fyodor was like "not before marriage hashtag christian life" so ivan was like "ok let's get married" and fyodor was like "sounds legit" not thinking that he would ever actually care about ivan beyond his plan (spoiler alert: he does! rip fyodor's attempt to remain isolated)
• ivan gets incredibly irritated if anyone enters the kitchen while he's using it so fyodor warns any guests he doesn't want immediately killed to just stay away from it lmao. unless he wants them dead, in which case ivan will squish them like little bugs with the precipice the moment a single molecule of their body crosses the threshold
• he was a child soldier in the great war. russia wasn't involved directly, but ivan was shipped off to and used by the UK, and then returned to russia after the war where he was then unceremoniously shoved into a mental hospital due to The Horrors Of War:tm: and his PTSD causing him to lash out with his ability, where fyodor later found him

i do yes! my main ones, and specifically the ones in BSPverse (my main canon-divergent verse i tend to write my fics in) are:
- harukousano (haruno, kouyou, and yosano, all in a polycule)
- higugin (i hc gin as being nonbinary and genderfluid but specifically genderfaer so fae's not a binary woman in my works, but fae isn't also strictly Not a woman bc genderfluid so. still counts as wlw in my book, the two are also just wlnb at the same time lol)
- naomi/charlotte (an OC of mine but i count it)
- teruko/adalcinda, aka meursault catgirl (yes. it started as a joke but it quickly became not a joke and now i love them deeply, i named her after a famous brazilian author)
- agatha/yuan (friend got me to see the potential and i like it)
- aya/sakura (sakura lives in bspverse, as do the other four orphans, and when i realized that meant sakura wouldve only been 2 years younger than aya, i made magic happen)
- there's also louisa and her two spouses, marjorie and william (both ocs of mine), and while william's a guy, marjorie is a woman so it counts imo bc it's just. wlwlm technically lmfao, since they're all married to each other
- also one of my friends (hi bestie io) headcanons nathaniel as a trans woman and i ship hawmitch regardless of what gender identity they're portrayed as having lmao but i've considered doing smth with that interpretation at some point and i do like the idea of it so i suppose that counts in that one specific instance

these ships aren't in BSPverse and thus aren't my main ships for the characters involved, but they are ships i enjoy and would probably consider or am planning on putting in alternate verses/fics of mine at some point, or writing one-off fics about:
- lucy/louisa/naomi
- montcott
- higulucy
- higusano
- naolucy
- tsujimura/higuchi
- tsujimura/yosano
- yosano/teruko

LMFAO i mean personally considering that i hc and thus write him as a trans man, like. he definitely faces and has faced a lot of that in the verses i put him in given all trans men irl face misogyny and often face it worse if we're openly out and trans and around ppl who don't want us to be. which was def the case for mori in BSPverse and most of the other verses which use the backstory he has there as well. he's also gay on top of that and openly so, so if someone for some reason didnt know he was trans, he'd still probably face misogynistic shit in the way a lot of GNC/effeminate/femme gay men do irl anyway

i am also not a huge fan of like. uh. if you mean this in the nsfw way, that's not a thing i enjoy thinking abt when it comes to his character & also the dynamic of the primary (and effectively only one, barring the two fukumoririmlaine aus) sexual relationship i write him in with fukuzawa so uh. i'm not mad or anything to clarify kjdfgndf just letting you and everyone else know so nothing gets too awkward

the same way asagiri names their parents (at least in BSPverse) ddfgk they're, with very few exceptions, named after real life authors, or something relating to them, as is shown on the bspverse document

in other verses this differs but usually i don't like name them randomly, in the event i have an entirely unrelated name, i use this website mostly. in other verses tho i usually go for names of the authors' kids, but sometimes i use authors who were inspired by the irl version of the bsd version's namesake if there aren't enough kids

i am indeed planning to make/write more fankids! as far as bspverse goes, i just recently finished reading gaiden and i've made six bastards for kyogoku/ayatsuji/tsujimura's family, i have to finish picrewing them but once i do they'll be revealed officially with their picrews (note that ayatsuji is married to both kyogoku and tsujimura in this universe but they are not romantically involved w each other nor are they married to each other either, and their kids all share ayatsuji as a father but they don't have any kids. also ayatsuji is trans and gave birth to them so if they'd wanted a biological kid it would've had to be on purpose and they wouldn't want to anyway lmao)

i also frequently make more fankids for other verses, but the verses aren't super well developed yet and most of them have no real solid storyline, whereas bspverse is. extensive lmao. bc it was the first and the one i think abt the most. so i talk less abt those verses bc for right now theyre like. babies. meanwhile bspverse is a whole young child now

my favorite fankids are hard to properly say bc i love them all (them meaning like, the ones who contribute/will contribute to the story plotwise somehow, i do love all of them but some of them are def not my faves, not bc i hate em but bc they just kinda exist and dont do much due to being toddlers mostly lmao) so much in different ways and while i talk/think abt more of them than others that doesnt actually mean i dont love them, BUT for the other question that's a more solid answer

the kid i relate to the most who has like, solid material you can go read in "the hateful eight", is yoshiko kunikida. and yoshiko i also relate to a lot in terms of personality and some ways in experience as well, like, her childhood is still way nicer in terms of how her parents treat her than mine was (hashtag abused child check) and she's def not abused by kunikida and katai, but she does have some of my disorders (OSDD, chronic fatigue syndrome with hypersomnia, ADHD, autism) and struggles with (later on) her physical appearance in ways similar to me. we're also built similarly body type wise and she, unlike most of her peers, is physically incapable of reaching the same levels of strength and activity as they are, which is relatable to me and always has been (i've never been able to do exercise the way most kids were, and now i can't do it at all due to pushing myself to do it as a kid bc everyone thought i was just lazy lmao. luckily that didn't happen to yoshiko but yknow, similar =/= the same)

oh i have a TON! literally so many. you can honestly assume the majority, if not all, of my characters are neurodivergent in some way, though i'm not sure if that's what you mean by disabled, and as far as i know i haven't given any of them intellectual disabilities yet, but that may change in the future.

of the ones i've written profiles for, my favorite with a physical disability is Akiyuki Kajii, who is partially deaf. of the ones without profiles, Ivan "Vanya" Dostoevsky II was blinded by an antagonist character when he was eight and now uses a cane as well as his ability to navigate, he's one of fyodor and ivan's kids as his name suggests.

but there are lots of other disabled characters too! Yoshiko Kunikida has CFS (chronic fatigue syndrome) and hypersomnia and is one of the eight protagonists in the hateful eight

others with disabilities who have profiles include:

Anastasia Dostoevskaya, who has a scar on her face and lasting nerve damage in her face from where she was stabbed
Andrei Dostoevsky, who walks with a cane
Francis Rawlings Alcott-Armstrong, who uses a wheelchair
Fumiko Dazai, who has a massive burn scar on her face and upper torso and is a double amputee from an explosion when she was twelve, and also has permanent nerve damage and a speech disorder (which was present from birth, but got worse after the incident)
Hyakken Fukuzawa, who suffered a traumatic brain injury after his middle school teacher nearly beat him to death, and now at times suffers with on-and-off seizures (they're less common than they used to be, but can still happen) and chronic migraines, as well as other issues surrounding his trauma
Kodou Kajii, who is partially deaf like his adopted brother, Akiyuki, though for a different reason
Kurt Rawlings Alcott-Armstrong, who is mostly deaf and partially blind
Murasaki Nakajima-Akutagawa, who occasionally suffers with seizures as a side effect from how her previously-uncontrollable ability, Tale of Genji, would cause her to have seizures whenever it activated, and now sometimes has them as a result of the damage that caused, albeit to a lesser scale now and far less often
Shuusaku Dazai, who has Congenital Insensitivity to Pain (CITP) and is unable to sweat or regulate his body temperature normally on his own
Takeshi Oda, who has schizophrenia as well as chronic pain issues starting later in life
Tatsuji Fukuzawa, who went blind in one eye due to natural causes as a child
Tatsuko Tanizaki, who also went blind in one eye due to natural causes as a child but loves telling people wild stories about "losing her eye" when in actuality the eye is still very much present under her eyepatch, she just likes to be silly
Tsutomu Fukuzawa, who has severe anemia, chronic vitamin deficiencies, chronic pain, and is prone to fainting spells, especially when on his period due to the anemia combined with bleeding heavily for idiopathic reasons (this is genetic and comes from Mori)
Yoshihiro Fukuzawa, who is eventually diagnosed with PCOS after entering puberty, and also has a service dog, Riki (whose profile is listed alongside theirs) starting when they're about five due to the severity of their autism symptoms (namely, they were prone to meltdowns due to overstimulation, which happened very easily) and anxiety nearly causing them to become homebound; the anxiety stemmed from separation anxiety from their parents, but when Riki was brought into the family, Yoshi bonded with him quickly, and found that their symptoms were easier to navigate and manage with Riki at their side; Yoshi also has selective mutism and will almost always prefer to speak using JSL rather than with their mouth
Yuriko Fukuzawa has BPD that was severe enough to get diagnosed at a young age