Quirk: Heat Energy
Quirk Type: Emitter
Quirk Class: Temperature and Fire
Ability - The user can absorb the heat around them. Heat contracts into a ball in front of them that looks orange. This heat can be converted into energy for the user if the absorb the ball into themselves. The user can also cause large damage to others by hitting them with the ball of heat energy. The area around the user when they create the ball of heat becomes extremely cold, around zero degree and can cause frost to form on windows and for others to be able to feel their breath.
Combat Range: Close and Medium
Disadvantage/s: - The user has to steal the energy from around them before they can attack.
Special Moves: Blinding Heat - The user pushes the ball of heat forward and disperses the heat before it hits a target. It causes light to blow away and blinds nearby enemies.
Hero/Villain Name ideas: Mercury, Thermal, Dial
My Input (not necessary): This quirk is pretty basic and standard. It seems like a class 1-b 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.