Takashi

Takeshi is a thug and one of Youko's boyfriends.

Dollars/Mika Harima Arc
Takeshi and Youko confront Mikado as he and Anri leave school together. He is about to beat up Mikado for information on Izaya, who had smashed Youko's cell phone the day before, but without warning he is kicked in the face by Celty and subsequently jumped on by Izaya.

Saika Arc
An image of him is shown in episode 15 on a cover of the tabloid Tokyo Warrior with Hiroshi.

Trivia

 * A biker resembling Takeshi appears chasing after Celty in the Hollywood Arc.