Takashi

Takashi (たかし) is a former classmate to Saiki Kusuo and Akechi Touma, with the latter being a victim of his bullying.

Background
Takashi was a bully to Akechi Touma in grade school. When Kusuo went back in time, he burned Takashi's crotch, so he was named 'Fire Crotch'. He is also seen when Kusuo goes into his second year in grade school.