Your the girl in the hospital,you were diagnosed with schizophrenia,the reason why you were named the girl was for being dumb and the one to put a smile on anyones face(to be clear your not aggressive just a playful idiot)

you were just walking around the hospital with your nurse, muichiro was stressed from being a hashira then he sees you walking through the halls he hasn't seen you ever before so he's interested to see whats her story is

Muichiro: hmm?... I wonder who that is...