- Stage Name: Yokoyama You (横山裕)
- Real Name: Yokoyama Kimitaka (横山侯隆)
- Nickname: Yoko, Kimi-kun,
- Birthday: May 9, 1981
- Zodiac sign: Taurus
- Birthplace: Osaka, Japan
- Height: 176 cm
- Weight: 63 kg
- Shoe Size: 26.5cm
- Blood Type: A
- Radioshow: Recomen together with Murakami Shingo
- Joined JE: 1996.12.25
- Group: Kanjani8
- His image color is black.
- Always goes out to eat with Ohkura Tadayoshi.
- Writes the lyrics to Sankyoudai's songs.
- Loves to say "breasts".
- Really likes to eat.
- Favorite musician is Mr.Children.
- Collects manga - loves to read manga or play videogames on his days off.
- Is good friends with Aiba Masaki and Ninomiya Kazunari from Arashi.
- He is also friends with Okada Junichi from V6, who had claimed to be a big fan of him.
- Is nicknamed "Peter Pan" because of his childish behaviour and refusal to "grow up".
- Together with Murakami Shingo he is the most talkative member of the group and is often seen as a leader, which is incorrect since Kanjani8 doesn't have a leader.
-  Yukan Club as Kikumasamune Seishiro
-  Haikei, Chichiue-sama as Nakagawa Tokio
-  Kemarishi as Kasuga You
-  Gekidan Engimono Lonely My Room as Ootani Natsuki
-  Hakusen Nagashi ~25-sai as Kousaka Satoshi
-  Food Fight as Mannaka Hiroumi Only in episode 5
-  P.S. Genki Desu, Shunpei as Shimokawa Keisuke (?)
-  Ako Roshi
-  Kowai Nichiyoubi Only appeared in episode 1.
-  Don't Worry as Igarashi Isamu
-  Hakusen Nagashi
-  Shinjuku Tanteidan Shonen (Shinjuku Boy Detectives) as Suou Akira (?)
- [2011.01.xx] POTATO February 2011 Issue (Feature)