My Hero Academia is a world filled with heroes. These heroes have mutations called quirks that give them superhuman powers. These powers can be categorized into three groups: emitter quirks that allow control over something, transformation quirks that allow for transformation, and mutations. One student at UA, Fumikage Tokoyami, has a mutation quirk like no other.
Tokoyami can be considered one of the most influential students in Class 1-A with Dark Shadow. What's so strange about Tokoyami isn't Dark Shadow but his bird head. As far as everyone knows, Tokoyami's bird head has nothing to do with Dark Shadow and his abilities. So, why does Tokoyami have a bird head?
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One reason that Tokoyami has a bird head is the type of quirks he has. Dark Shadow is categorized as an emitter quirk because Tokoyami can summon and control him at will. Well, control him the best that he can consider that Dark Shadow is sentient. This means that Tokoyami's bird head mutation gives Tokoyami two different quirks.
Something that is known in My Hero Academia is that quirks are inherited. A great example is Shoto Todoroki, with his fire and ice emitter quirk. He got his fire quirk from his father and his ice quirk from his mother. This would mean that someone in Tokoyami's family must have some type of bird quirk that gave him the bird mutation. There could also be a member of his family with a similar shadow emitter quirk. This theory can't be proven because fans haven't been introduced to Tokoyami's parents or seen what they looked like.
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