- Name: Maruyama Ryuhei (丸山隆平)
- Nickname: Maru, Maru-chan
- Birthday: November 26, 1983
- Birthplace: Kyoto Prefecture, Japan
- Blood Type: A
- Height: 175 cm
- Weight: 65 kg
- Shoe Size: 27.5cm
- His image color is orange.
- Has said that if his very, very cute little sister gets a boyfriend... He'll have to discuss the matter with their father.
- Loves sweets and hates green pepper and bitter vegetables.
- Together with Murakami he came up with the nickname Tatsuyoshi for Ohkura, claiming that Tadayoshi was too hard to say.
- His phrase for confession would be; "I love you so much to you".
- At concerts during MC he and Subaru very often talk in unison - even making the intonation the same.
- He hasn't said this himself, but it's very probable that his favorite phrase/word is "PAAAAN!!".
-  Double as Maruyama
-  Jitensha Shonenki as Souta
-  Meitantei Catherine vs Totsukawa Keibu as Tsuchida Shirou (?)