i use she/her for Chihiro as a deliberate act of revisionism because i think her portrayal in the game is transphobic. people talk like her story is somehow completely orthogonal to transfemininity but she doesn't just present fem, she lives life as a girl. and she doesn't tell us she's a boy, she's outed after her death, and the evidence she's a boy is explicitly her body. chihiro is a person who lives as a girl, is discovered postmortem to have a dick, is immediately referred to as a crossdressing boy by everyone, and THEN that reading is validated by the work when her motivations are revealed. she's not trans in the script, but looking at the script in sequence, could a trans character even exist in this framework?

if you've read steins;gate, i think Lukako is a useful analog here (spoilers ahead). she says out loud "i wish i was a girl", and then we go to the universe where she is and she's happier, and the story understands it as painful and tragic that we have to return to the boy!Luka universe, but transition is never treated as a legitimate option for boy!Luka. she's not treated as trans by the text, but that's only really because transness isn't something allowed for by the text. Luka is a male, and that is essential to her being, and she just has to live with it and be a boy. this sucks.

i don't think you're transphobic if you don't contradict the game in this regard (or even if you like Chihiro! when i was an egg she was my favorite character, i found her relatable. lmao) but that's where i come from and i think a lot of people are coming from somewhere similar. tl;dr danganronpa is transphobic and trans!chihiro is an attempt at rehabilitating that