Chapter 1: Basic Information you can skip if you what.
Izuku Midoriya
Age at beginning of story: 6
Original Quirk: Quirk Absorption and Break down, this quirk allows the user to absorb and permanently copy quirks that they come into contact with while also nullifying the effects (ie. Overhaul tries to disassemble him, but instead, all that happens is that Izuku gains the quirk). The user can also get copies of the same quirk if he gets hit multiple times only if it comes from another user. The quirk can also break down and reconstruct the quirks it absorbs, which can make the quirk stronger or make a variation of the original (i.e., Absorbing Half-Cold Half-Hot at least 2-3 times can allow for the creation of a full body pyrokinesis, cyrokinesis, thermal control as so on) the more copies of the same quirk available, the more stronger quirks can be made. It can also make multiple quirks if enough copies are made.
Copied/Improved Quirks:
Body Lock: Originally allows the user to freeze others body when they come into contact with them. Reconstructed to Control Devil after 20 copies and Body Morph after 10 copies.
Quirks Origins: Izuku was wandering around by himself after getting bullied by Katsuki when he's suddenly taken into a secluded wooded area of the park where he was about to be assaulted by a man which quickly backfired into a cycle of repeated quirk usage with Izuku coming out on top. And also finding his first outlet for his hidden sexual desires. (He gained Control Devil and Body Morph during the scuffle.)
Control Devil: allows the user to control anyone or thing as long as he shook hands with them or a weaker will the the user.
Body Morph: allows the user to temporarily transform parts of the body as long as they have a clear picture of the end product.
Explosion: Originally allows the user to secrete nitroglycerin type sweat from their body, able to ignite it at the palms of the hand. Reconstructed to Naplam after 20 copies.
Naplam: allows the user to create a wave of fire and explosions in an area whenever they're touching the ground. Reconstructed to Fire Starter after breaking down 5 times.
Fire Starter: allows the user to start fires of varying sizes and temperatures on whatever they touch, able to ignite it whenever they want as long as they snap.