Quirk: Twin Skulls
Quirk Type: Transformation
Quirk Class: Body Morph and Familiar
Ability - The user has two skulls faces (not full skulls) in their hair. One being purple and the other being blue. The skulls don't speak but make laughing type sounds to convey what they are feeling. The purple one is lot happier but extremely volatile to mood swings if they get annoyed. The blue one is a lot grumpier and likes it when someone else is being hurt or is getting frustrated. The two skulls do different things. The purple one doesn't change in size but can alter the hair they rest in, making it grow so it can attack opponents at a range. The blue one doesn't alter the hair but does increase in size and able to act as a shield to the user. The skull faces are durable but are susceptible to being cracked and broken. Sharp weapons like swords or axes can chip the skull. If they are damaged the skull will slowly regrow.
Combat Range: Close and Long
Disadvantage/s: - Despite the skull faces having their own mind, they still act and react like the user. So if the user panics, it could cause their skulls to revert to their original form.
- The skulls have their own stamina and the user can tire them out if they don't allow them to rest.
Special Moves: Skull Gear - The user can have their skulls wrap the user's hair around their body. The purple skull covers the users face which can extend out The blue skull is on the users back which the user can spin around and have anywhere. The user can also manipulate their hair slightly to wrap someone far away.
Hero/Villain Name ideas: Burial, Goth Star, Catacomb-o
My Input (not necessary): An interesting idea of a familiar quirk that can do multiple things. It is kind of like Tokoyami's. I see the person having pigtails with their skulls on each one.

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Future Quirk Concepts (2)
FanfictionSecond book on this topic. Just some ideas that can be infused with the would of My Hero Academia. No need to credit as a lot of ideas are no longer original.