Quirk: Igneous
Quirk Type: Transformation
Quirk Class: Fire and Earth
Ability - The user can grow igneous on their skin. It makes the user heavier and slower, but it increases their defense and durability as well as creating a stronger punch. But the user can also crack the igneous by activating the magma part of their quirk. The user can splurt out the magma like blowing a razzberry. After about two seconds, the magma will harden into igneous.
Combat Range: Close
Disadvantage/s: - The user moves slower when activating their quirk and when using magma, they end to restrict their own body.
- Over working themselves by exercise and using the magma will cause heat exhaustion.
Special Moves: Eruption - The user fires magma from as many places as they can. Completely wild and everywhere. Some of the magma lands on the user, creating more igneous armour.
Hero/Villain Name ideas: Terrorshock, Vulcan, Kaiju
My Input (not necessary): A quirk I definitely see a hero hopeful have. Being the big guy in the class like Mezo but probably being a lot rougher and hard headed.

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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.