Fuyuhiko is initially incredibly stand-offish and rude to everyone and anyone he doesn’t trust and or care about. When Fuyuhiko does interact with the others (by choice or otherwise), his attitude is combative and irritable. He's easily angered, often threatening and/or insulting other people when they disagree with or complain about his actions.
He’s quite insecure about how short and how feminine he looks and tries to act like a “matcho” kinda of guy but is quite intelligent and witty.