Quirk: Freak
Quirk Type: Transformation
Quirk Class: Body Morph
Ability - The user can change how their body looks. Their skin and bones grow and shift. The user grows 2 feet taller and an extra three arms. Their jaw can now widen far enough to cover a persons head and their arm reach spreads 6 feet wide. They become incredibly unnerving to look at, almost like they are a monster. However, even in this form the user does not get stronger other then help from their arms and extra height and their durability stays the same. They do become faster and have a much easier time in climbing.
Combat Range: Close
Disadvantage/s: - The user can stay in this form indefinably, even while asleep. But wounds they receive from extra body parts will open on the users actual body when transforming back.
- The user is not stronger or sturdier despite the change in appearance. They also stay the exact same weight even with the extra arms.
Special Moves: Intimidation - Despite not having many more super natural powers, the sheer appearance of the users form would be enough to frighten a lot of people.
Hero/Villain Name ideas: Ghoul, Freak Town, Cleaver
My Input (not necessary): This person would be someone who failed the entrance exam to a hero school and now is trying a different path. Becoming a villain or trying to get into the general course, it didn't matter. They would have always been told they had a villainous quirk.

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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.