Mamjiro Mano also known as Mikey was the leader of the gang Tokyo Revengers. He was the leader because he was stable in fights, he didn't like the fight because he was still so young as a teenager but he did it anyway when he needed to. It was scary because he usually killed the man he was fighting. Kazutora was his bestfriend but after Kazutora accidently murdered his brother that was it between there friendship even though he was still part of Tomean there gang.