One For All

One For All (ワン・フォー・オール) is a Quirk used by All Might and Izuku Midoriya.

Description
This quirk grants enhanced strength, speed and the power of flight to the user. It is named, "One For All" because it can be passed down to others who the current user deems worthy. The user can freely concentrate 100% of their power onto any part of their body. Inexperienced users (such as Izuku) whose bodies are incompatible or incapable of adjusting their power will result in severe recoil. If the physical condition of the new successor is undefined, their bodies will be ripped apart from the massive power; therefore, extensive training is crucial to wield this Quirk.

All Might: As a well renowned hero, All Might is a proficient user of this Quirk. He is capable of controlling his own strength and focusing is power onto and extremity he chooses without recoil. Due to an untreatable wound that's been inflicted on him, he can only utilize his power for three hour straight; any more would strain his body. All Might can throw a right punch with enough force that the wind pressure sends anything made of liquid flying away and even clear the weather.

Izuku Midoriya: Izuki is the new successor of "One for All" chosen by All Might. He is strong enough to knock down a giant robot with one strike, focusing his power onto his limbs and produce a shock wave with one finger; all at the risk of severe injury. He is yet to discover his power to fly or display enhanced speed and is still incapable of adjusting his power.