Shoto Todoroki has a twin sister, often seen as weak, but strong in her own way. Yuki Todoroki a girl with Red hair and shining grey eyes, shoto loved his little sister, being older than her by a few minutes. Shoto took his job being an older brother seriously, defending her from enji, their father from getting too involved in the hellish training he makes them do. She has had a weak heart since birth, even so affecting her now that she has inherited her mother's ice quirk. Though very powerful, it too, had a problematic drawback. Despite her heart being weak, she went through all sorts of therapy to make it healthy again, proper and healthy food diet, water consumption and a heart surgery needed for her heart. She survived it all, thanks to the support of her mother, her older brothers (shoto and natsuo) and her older sister, fuyumi. Day by day, her power gets stronger inside, without her proper training, it get locked in, waiting to burst.