Quirk: Arm Cannon
Quirk Type: Transformation
Quirk Class: Body Morph and Speed Enhancement, Destruction
Ability - The users left arm is all chunky and mushy. The flesh of the arm feels like it there are no bones in it. The arm is also longer, it reaches the ground from the user standing. Objects can merge with into the arm, making it even more chunky. The user can aim then launch the object at high speed, having the power like a cannon. The objects don't have to fit, the user can have things somewhat absorbed and launch them out, but the power will be significantly weaker. The user can also hold objects in tightly, making it impossible for others to grab them out.
Combat Range: Long and Close
Disadvantage/s: - external components are needed for the quirk to function well.
- It is a huge weak spot for the user, being a major target for others to strike if the user has no ammo loaded in the arm as they struggle to fight back in that area.Special Moves: Misfire - When the user has large objects piled in their fleshy arm they can tighten the muscles in the arm to stop any of the objects from being moved. The user can additionally try and explode the objects out but it won't work. This causes the users arm to move at high velocity and have heavy surfaces to smash against other people.
Hero/Villain Name ideas: Railgun, Militant, Brandstone
My Input (not necessary): This is an interesting quirk that has good application at long and close ranges when the special ability is accounted for. This is a nomu quirk as the deformed arm would match perfectly with the insane science experiments.

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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.