Takeshi (Kamen Rider) - Oni

Oni

An Oni is an exceptional athlete who has acquired amazing fighting abilities through intensive training and the use of advanced weaponry. His or her most powerful equipment is both a weapon and a musical instrument, whose "pure sounds" are the only means to purge the evil spirits of the Makamou. Oni follow a one-master-one-apprentice tradition.

Upon the retirement of their master, an apprentice will inherit the responsibilities as well as all equipment from his or her predecessor. He or she will often inherit the master's title, too, though there are exceptions. When a person transforms into an Oni, the persons' clothes are often burnt up or sliced to pieces in the process, though there are ways to learn how to not let them be destroyed. If an Oni fights relying on his or her anger, the forehead emblem will grow over the face. When an Oni becomes evil, the headquarters decide if they should be eliminated. If they decide to eliminate the Oni, they send someone from the head family to carry out the task. In the TV series, there are a total of 113 active Oni in Japan, a total of eleven active Oni operate in the Kanto region, but only eight have shown up in the series. Also, 3 other Oni are later introduced and another one is mentioned as the show proceeds. Five more Oni are introduced in The Seven Fighting Demons, the movie spin-off of the TV series.