Prolouge

Izuku is born with the quirk alchemy being able to create things form other things he cannot creae something out of nothing equivalent exchange
There's no such thing as a painless lesson they just don't exist sacrifices are necessary you can't gain anything without losing something first although if you can endure that pain and walk away from it you'll have a heart strong enough to overcome any obstacle a heart made fullmetal izuku learned this lesson by losing his mother then trying to revive her using the taboo he is then adopted by the Bakugous he now has a automail arm and leg (also I know Ed only lost his leg to revive his mum but I just prefer it this way)