Board Thread:Questions and Answers/@comment-25001290-20160627214958/@comment-27001684-20160627215522

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.