Ryôta Koyama

Ryota Kohama (Japanese: 小浜良太, Hepburn: Kohama Ryōta; born 4 September 1989), better known by his stage name Ryota, is a Japanese musician who is best known for being the bassist of the rock band One Ok Rock.
He was in the hip-hop dance group Heads along with Toru Yamashita (guitarist of One Ok Rock) before they disbanded in 2002.

Biography fallback source: Wikipedia