Aizen "The Prophet, Eisen, Sensei" Otisu

About

Aizen has been living in the Spirit world, ever since he was summoned to help, 20 Spirit world years ago.

Since the time flow is different in Spirit world, in the Human world, most of his apprentices have grown up and had their own career, they are now commonly known as "100 geniuses".

He won the battle against the sword demon but lost the ability to control his powers so he sealed his powers to a tree in human world.