Izuku Yagi he was a quirkless boy who had a horrible life he was never gaven love or treated fairly by his family he was neglected and abused by them and his friends everyday his life was hell but izuku didn't give up he became strong in his own way but since his family and friends saw him as useless they're decided to end izuku and get rid of him but that was impossible izuku fought all the pro hero's of Japan along with the his family and so called friends he was Able to defeat all of them even though he was poisoned after that he dies as he thought everything was over but to his surprise he get's reincarnated as the son of doom slayer we're his parents trained him and showed him love he even grew stronger then his parents as they're didn't want izuku to spend his entire life killing demons they're decided to send izuku to a different world to have a peaceful life we're he ends up in the solo leveling universe and starts his journey there