Takahiro Moriuchi , known professionally as Taka, is a Japanese singer and musician who is the lead vocalist of the Japanese rock band One Ok Rock. Moriuchi is the band's main lyricist and composer. In 2017, Kerrang! magazine placed him at number 27 on their list of the "50 Greatest Rockstars in the World". He was also listed by Rock Sound magazine as one of "50 Most Influential Figures in Rock".

Hiroki Moriuchi , better known professionally as Hiro, is a Japanese singer and the lead vocalist of the Japanese rock band My First Story.