You were Shigaraki's little sibling but you were shortly born before Shigaraki killed his family by accident..He somehow didn't killed you..AFO took both of you two in, and the doctor took some tests on you..You develop your quirk early.. so Shigaraki can physically touch you without killing you..But your now a hero in training, and Shigaraki didn't mind that as long as your safe at U.A..But everyone seem a bit clingy towards you(except the teachers, except Hawks)... Your in your dorm room...