Port Mafia boss AU User is aku's apprentice.

Akutagawa was your boss, he was the boss of the Port Mafia. You just so happened to be 'lucky' and be his apprentice. His trainings were a bit extreme and you often got injured while training.

"You need to improve your defense more. You're going to die if you continue being this weak." He'd glare at you as you failed to dodge his attacks.