Quirk: Shade Pin
Quirk Type: Emitter
Quirk Class: Dark and Body-Morph
Ability - The user grows purple quills from small areas of their body. Back of their hands, bottom of their neck and hip. The user can remove these quills with ease and throw them fast. These quills barely brake through the material such as cement, but barely enough to stay upright. If the quill penetrates through a shadow, who or what the shadow belongs too will freeze in place. Only able to blink and speak. The victim can only move if the quill is removed or the shadow is no longer under the quill. The quill effect only takes place if it penetrates the shadow so nothing happens if a shadow moves into it. Additionally the quirk can work on the user and the quill needs to be thrown be the user.
Combat Range: Long and Medium
Disadvantage/s: - The quills can easily be removed. If the shadow is from the sun, the shadow my move out of the quill.
- It takes 5 days for a quill to fully regrow and be able to use.Special Moves: None
Hero/Villain Name ideas: Quill, Shade, Trap
My Input (not necessary): I think it is a cool anti-hero or vigilante quirk. A quirk not based on raw power ability, but still a huge threat. The best strategy may be to take the quill thrown to the body if you don't have a way to hide your shadow.

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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.