Zell Tsukiko (ぜる とすきこ, Zeru Tosokiko) also known as Immature Assassin (おさないしかく, Osanai Shikaku)is the No.5 in the Society of Darkness and renowned for his monstrous strength. He is a well known and respected Shinigami, who was once predicted to be a future captain in the Gotei 13. Being one of the feared 15 members of the Society of Darkness, he has considerable power and also has a big bounty on his head. Unlike most members in the Society of Darkness, Zell is often causing lots of trouble and usually boasts about him being in SOD. Despite his appearance, bounty hunters know of his reputation and his nickname. Zell is also known as one of the best and most famous swordsman, he is considered legendary and has unimaginable skill.