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
Little is known about this ability and how exactly it works, however it has been shown to grant the user momentary super strength at destructive levels or increased agility. The Quirk receives its name from the fact that it can be "inherited" by others. The method of inheritance is not clear but All Might has shown to give it to others by having them ingest a strand of his hair. Proper usage of the Quirk requires intense and rigorous training of the body to prevent the successor from being torn apart from the raw power. Even with the training, the Quirk still puts intense stress on the users body.

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 any 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.

Izuku Midoriya: Izuki is the new successor of "One for All" chosen by All Might. He has displayed incredible bouts of strength however because of his inexperience in regulation it usually results in the destruction of parts of his body. Still he is able to moderately distribute the power to specific limbs such as his fingers.