Quirk: Amphibian
Quirk Type: Mutant
Quirk Class: Body Morph and Water
Ability - The user has weird attributes added onto them. Their hands and feet are covered in aqua marine, however they are soft and don't work well for defense. What these scales can do is store water that allows the use to fire pressurised water they have drunk or absorbed by being in water. The user also has gills that allow them to breathe underwater while still being able to breathe normal air. The user also can propel themselves faster in water that allow them to swim faster.
Combat Range: Close
Disadvantage/s: - The user produces a lot of water and usually will leave puddles in places he has stayed still in for a while.
- The user likes being wet so if they loose a lot of water to quickly, they become vulnerable.
Special Moves: None (It will all be generic things)
Hero/Villain Name ideas: Trident, Neptune, Marine
My Input (not necessary): An aquatic quirk that gives the user an inherent advantage underwater. Not many quirks do that and if you think about it, being able to spray water would be useless when you are submerged wouldn't it?

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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.