sparring buddies!! majima also fights a lot -- (and is also a good dancer also DANCES IN BATTLE yakuza wtf) i would say he probably feels bad about fighting a 16 year old but you fight a giant 12 year old in canon so like i'm 100% here for it

majima is also A PROPER MAN. he was a punk as a kid and would probably try - once they got to know each other outside FIGHTING to help be a good(ish) influence to him until the eventuality where the reality of being from a series literally called yakuza comes calling