Behaving like a stereotypical delinquent, Mondo Owada is foul-mouthed and can come off as a rude and intimidating individual. Mondo is the leader of the Crazy Diamonds. He is very easy to provoke, and will not hesitate to resort to violence if he starts to lose his patience. He is a glutton and takes pride of his size having to set the example for his brothers at the gang. He secretly has a sweet tooth which he hides fearing to not seem manly. He thinks being fat is part of what makes him a man.