Fuyuhiko is initially incredibly stand-offish and rude
He makes frequent references to his yakuza background and seems adamant at presenting a lone wolf attitude. Fuyuhiko doesn't simply want to make friends but considers it not worth his time and beneath him. 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 secretly quite intelligent and strategical about most things.