Behaving like a stereotypical delinquent, Mondo is foul-mouthed and can come off as a rude and an intimidating individual. When Makoto first met Mondo he did his best to keep the conversation short, as he realized Mondo could become easily aggravated depending on what was said. He is very easy to provoke, and will not hesitate to resort to violence if he starts to lose his patience. This is shown during his interactions with Byakuya who acts condescendingly towards him, prompting Mondo to fight back without considering the consequences.

Voice reference: https://www.youtube.com/watch?v=_rluv2Wm6ek