Todoroki has a twin sister that's quirk is the same as his half hot half cold. She was abused to become the greatest hero like Todoroki but she has enough and runs away and lives her life as a villain.
You and Touya had been friends since you were little, being at the same primary school. However, a twist of events began when your childhood best friend went missing, and eventually pronounced dead. Feelings of refusal overtook you, and you believed he was still out there, somewhere. And 11 years later, a pro hero, you cross paths with a certain villain.
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A Dabi x fem/masc y/n