Quirk: Toxic Spine
Quirk Type: Mutant
Quirk Class: Poison and Body Morph
Ability - The user grows black sharp spines all over their back in random areas. The user can make these spines grow and twist how they want but can't change how they grow, unless they reverse it. These spines can't grow to fat off the user, only about one metre. They are also quite soft but the tip is pointed and sharp. The tips of the spines produce a dark green liquid that burns and it hurts like crazy if it is injected. The user can't spray it far, only 20 centimetres away so usually it is injected.
Combat Range: Close
Disadvantage/s: - Despite the user being able to individually control their spines, they have horrible control if someone were to grip one of their spines and it seems like their senses go wild and are difficult to make out.
Special Moves: Toxin Shower - The user manipulates their spines to move out in front of them. The tips all point together, the tips touching but the angle slightly facing away from the user.
Hero/Villain Name ideas: Lion, Venovile, Crank
My Input (not necessary): An interesting quirk that I see the user having more then average martial art skills and capabilities.

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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.