Kazui was originally a Hatoful Boyfriend fancharacter that kind of spawned into more; his form is a little nebulous, he can be a human, or a werebird, or just a regular ol' crowned pigeon

in human form he's 5'2"
in pigeon form he's average size
in were-battle-form he's like 7'

he pretends he's a cool dude but he's really just a giant dork. he thinks he's a real badass when he's riding around town on his electric bicycle without a helmet oooooo

(full/actual character bio forthcoming)