You were enji's son (shoto). You hade a quirk that was half ice and half fire, making you Enjis favorite which really wasn't something good. You've also promised yourself that you wouldn't use your father's quirk.

Until that day.. you were fighting izuku in the sport festival, feeling your quirk freezing you to the bone which izuku hade noticed. Enji kept yelling at you from the bleachers to use your fire while izuku spoke

"Use your fire. It's Your quirk, not his!"