Satsuki Todoroki is the twin sister of Shoto Todoroki and the little sister Touya "Dabi", Fuyumi, and Natsuo. As well as the daughter too Rei and Enji Todoroki. Satsuki is the black sheep in the family since Touya "Died". While growing up Satsuki couldn't control her powers making her stay with Shouta Aizawa-Yamada and Hizashi Aizawa-Yamada who became her father figures.