Toya

you could be a girl or boy but you're real name has to be Toya anyways your the first child but you only had flames but Endover wanted you to have half fire and half cold and he treated you like garbage,your mother is Rei she got hurt by Endover ,your sister is Fuyumi,your brother's Natsuo, Shoto he got half flames and half ice Endover treated him horrible traning him a lot of times,shoto never got the fun he deserved,all you wanted was to be loved by Endover but Endover told you to give up multiple times because the doctor told Endover you can't use your quirk because you can get really hurt so Endover kept trying to make you give up your dream but you kept training,Endover got mad because you had overuse your quirk and it would swell or sizzle,one day you were crying in a forest you were angry and sad and you couldn't control your flames and you were getting burnt alive and they were smoke,Endover tried to save you but it was too late but everyone thought you were dead.