shota aizawa and hizashi yamada adopted a young girl before she got her quirk. but when she did, it was terrible. her quirk is over modification, a power that is constantly activated. when she touches someone it transforms their quirk factor, it allows that person to temporarily enhance or alter their power, they get a boost. however, if she touches someone who is incompatible with her ability, pain shoots through their body instead. but, if she doesn’t release a certain amount of power from her quirk, it turns against her body. shes racked with painful seizures and gets fevers. she is terrified of loosing herself through her quirk.