[11] However, in the June 2012 issue of the magazine, Rockin'On Japan, he stated in an interview that his real name is Takahiro Moriuchi.

[14] Taka wrote the song "Nobody's Home" on fourth album Niche Syndrome, tells about his apology and gratitude straightforwardly for his parents.

[15] On November 14, 2023, he and his brother Hiroki performed the Nobody's Home together with their bands on My First Story X One Ok Rock concert "VS" at Tokyo Dome.

He joined as a trainee in the group called Johnny's Junior and made some singing appearances on Japanese music shows during this period.

In September 2003, two years after joining the agency, Taka was one of the Johnny's Juniors chosen to be part of the idol group NEWS.

In March 2013, Simple Plan announced a new version of their song "Summer Paradise" with Moriuchi for a Japanese-only release [22] They later performed together at the music festival, Punkspring 2013 in Tokyo, Japan.

[23] In November 2013, Taka helped Pay Money to My Pain to sing and write one of their songs on their tribute album Gene after their vocalist, K (後藤慶, Kei Gotō), died due to heart failure.

[26][27] As of July 2015, One Ok Rock is signed with the U.S. label, Warner Bros. Records and released an English version of their album, 35xxxv in February 2015.

[29] On May 12, 2018, he guested on Linkin Park co-vocalist Mike Shinoda's show at Identity Festival in Los Angeles, performing "Waiting for the End / Where'd You Go" mash-up.

[32] His greatest influences are Linkin Park,[33] Good Charlotte, The Used, Red Hot Chili Peppers,[34] Thirty Seconds to Mars,[35] hide, Maroon 5, Adele,[36] Rize,[37] Issues, Sum 41, Green Day and Simple Plan.