Quirk: Claw Parasite
Quirk Type: Transformation
Quirk Class: Body Morph and Familiar
Ability - The user's hand is pitch black as they have an additional layer over the top. The additional layer can't be removed by the user or anyone else. It is a permanent addition to the user. The user can make this black 'glove' grow. The user can manipulate it to create a claw or additional armour that is quite durable. However the more of the black matter they manipulate grows, the entity of the black matter starts to come out. The blackness grows eyes and a mouth to speak and it makes it harder for the user to use their quirk. The quirk isn't trying to hurt the user but it is wildly unstable and wild and unpredictable. The user looses all influence when the black matter completely encases the user.
Combat Range: Close and Medium
Disadvantage/s: - The user looses control of their quirk the more they increase the power of their quirk, allowing dangerous insanity to take over.
- Sound is the best attack against the claw entity as it enlarges in power, but it also allows the user to keep control.
Special Moves: Serrated Web - The user creates black mass covering most of their arm. They then shoot it forward in thin lines with several pointed edges that allow easy ability to cut through multiple layers of materials.
Second Punch - The user shoots out a punch at their enemy with black mass all around the fist. When the punch is about to connect, it shrinks and widens, swallowing the entire head of the opponent. The user then manipulates their black mass to heavily punch the victim in the face.
Hero/Villain Name ideas: Parasite, Nucleon, Duo
My Input (not necessary): This is a mix inspiration on the anime Parasite and the anti hero Venom.

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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.