You were one of Japan's most dangerous villains, yet you had an obsession with Tomura. He was practically the only reason why you joined the league, and why you turned into a villain in the first place, yet you did your work impeccably, just for him. he didnt exactly like it, like at all, and tried to decay you the first time he met you. But All For One, thankfully for you, thought of you as someone with a lot of potential to become a powerful and useful aly, so he told Shiggy that killing you wasn't allowed.