Quirk: Rattle Snake Explosion
Quirk Type: Mutant
Quirk Class: Animal/Insect and Destruction
Ability - The user has a snake tail just above their asshole. The users snake tail is yellow with brown spots and having a pale cream underbelly. At the tip of the tail is a large rattle snake bulb. When the user shakes it, it sounds like maracas. But if you look close enough, you can see fire emitting from the tail. When the tail makes contact with a surface, it will create an explosion. The longer the tail rattles, the stronger it will be. The tail stretches slightly more then 2 metres away.
Combat Range: Close
Disadvantage/s: - The user is commonly in range of their own blasts.
Special Moves: None
Hero/Villain Name ideas: Rattle Snake, Venom Blast, Slither
My Input (not necessary): A interesting quirk and something that people will quite like. It wouldn't be overly strong despite not having a sizeable weakness but I think it is still pretty cool.

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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.