Quirk: Betrayal
Quirk Type: Transformation
Quirk Class: Strength Enhancement and Mental
Ability - The users quirk activates from an answer to their question. They could tell whether or not someone was yelling the truth or not with their quirk by determining the increase in their strength. When a lie is told to the user, their strength is drastically increased and depending on the level of lie the other person believes it to be, it further increases their strength. For example, someone saying they completed an assignment when they only finished half increases the users strength by about 30% compared to someone lying about murder, having their strength increase by 100%. There is no level cap of strength the user can have.
Combat Range: Close
Disadvantage/s: - The user can't purposefully enhance their strength as lying to them with that intent will increase the users strength by less then 1%.
- If the lie is small, the user may not feel the enhance strength they receive if they already have their strength increased.
- It's hard to get good answers from people in an actual battle situation, leaving this quirk to be more of a looming threat quirk.
Special Moves: None
Hero/Villain Name ideas: ID, Search, Anchor
My Input (not necessary): This type of quirk is like a loyalty quirk. It works as a lie detecting quirk but it substitute the accuracy most other quirk like that have for the advantage of gaining physical ability. This quirk is mainly for a person to interrogate someone and if they lie, they can't fight back when the user calls them out. This quirk would be a trusted underling quirk or a police persons 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.