this is probably a very niche thing, but do you have any hand headcanons about pathologic characters? as in, who's right-handed or who's left-handed... or both.
YESSSSS OMG #YASSSSSSSS I DO! I DO IN FACT! IT'S NEVER TOO NICHE FOR ME HONEY #THOUGHTSHAVER
since most of the population is right-handed, imagine that if i'm not mentioning anyone they're either right-handed OR i don't have any particular headcanons. + you get some handwriting headcanons as well, a "buy one get one free" deal
Dankovsky: right-handed, relatively neat writing when he wants, otherwise you're getting that Doctor's Handwriting
Burakh: naturally right-handed, but he trained himself to be able to write with his left hand when he sprained his wrist age 14. his left-handed writing is kinda fucked up and it's obvious that's not his natural dominant hand, but if you squint and focus it's readable
Clara: ambidextrous, but she has very rarely written in her life so she doesn't even notice.
Andrey: naturally ambidextrous, has a left-handedness dominance
Peter: naturally ambidextrous, has a right-handedness dominance
(fun fact about ^ i headcanon that they always had to be sat together at school and for a while the teacher didn't understand why they didn't get any work done and then realized that's because the way they had them (peter on the left and andrey on the right) their elbows keep bumping in each other's so they just switched them around and it was fine)
Rubin: naturally left-handed but trained himself to be able to write/do other stuff with his right hand in case (it was for him a thing of like Discipline)
Lara: right-handed, relatively clean handwriting unless she starts losing it and scribbling
Eva: right-handed, neat handwriting, likes to either embellish her lettering a lot or have very "dry", austere, almost worryingly simple shapes
Yulia: right-handed, a nervoussss writer, very tense grip on the pen, very low and slanted letters
Nina and Victoria: both ambidextrous
Katerina: naturally ambidextrous, her proficiency in both hands has been coming and going, and her morphine addiction has made her lose her grip and stability on her writing to the point it looks like chicken-scratch now
Capella: naturally ambidextrous, she uses mostly her right hand so far but will learn to use the left one more as well as she grows up + trains with stuff like sewing, embroidering, playing instruments,...
Khan: right-handed, relatively clean handwriting. it gets cleaner and more precise as he grows up because he goes on to go to college and learn languages, so he takes pride and effort into materializing the letters of languages other than his own like greek, arabic, any using the latin alphabet, etc.
Notkin: left-handed. he's barely literate because of his Shit Life Syndrome making his writing, when he tries, somewhat unintelligible. since he barely ever writes he has no muscle memory of how to hold his pen so his left hand doesn't smear the ink all over.
Catnip: right handed, clean and pretty handwriting, her grammar is kinda shit but she has an excuse. she's an orphan.
Dandy: left-handed, messyyyy handwriting, but his grasp on grammar's preddy good. paired with his sister ^ they make for Notkin's Redaction and Deciphering Team.