A Quirk (個こ性せい, Kosei?, lit. "Individuality"), formerly known as a Meta Ability (異い能のう, Inō?, lit. "Extraordinary Ability"), is a superhuman ability that a person can possess. Along with being unique to each user, Quirks are sorted into multiple categories. Quirk users are also limited to only developing one ability and are thus unable to achieve any other through natural means.