Board Thread:Questions and Answers/@comment-25001290-20160627214958/@comment-34416698-20180121050555

Gearbram wrote: So far only Shigaraki's Mentor and the Noumus have displayed multiple Quirks. Shigaraki's Mentor has multiple Quirks due to his own ability, which allows him to steal Quirks and the Noumus are creations of him, which he equipped with multiple Quirks. Also, All Might's and Izuku's One For All is a fusion of two Quirks. Actually, they are not the only ones. All Might's predecessor, Nana Shimura (Tomura Shigaraki's grandmother), had a quirk before she received OFA. When she got OFA, the quirks didn't fuse together or anything, they just coexisted like the Nomus quirks, except that they were compatible and could coexist, whereas the nomus couldn't, resulting in experimentation. When Nana had completely used up OFA after she gave it to All Might, her original quirk stayed there, meaning if you are given a quirk it is not always fused, and if one is taken, the other will stay (Depending on who takes it or how it goes).