Matsuyama Kenichi, who is known for his affinity for strange character roles, was born in Mutsu, Aomori Prefecture in 1985. In 2001, Kenichi started his career as a model. In 2002 he made his debut as an actor landing a small role in the NTV drama "Gokusen" as Kenichi Mori. In 2003, Kenichi expanded to movies and landed his first supporting role in "Bright Future". Kenichi's acting career expanded with his role as Shin in the 2005 movie "Nana". His major breakthrough came in 2006 with Kenichi's charismatic performance as "L" in "Death Note" and "Death Note: The Last Name". Since then he has performed in a variety of different roles like the shy death metal rocker in "Detroit Metal City" and the youth that falls in love with an older woman in "Don't Laugh at My Romance". More recently, Kenichi has worked with foreign directors like Korean-Japanese director Yoichi Sai in "Kamui Gaiden", Vietnamese director Anh Hung Tran in "Norwegian Wood" and American director Hans Canosa in "Memoirs of a Teenage Amnesiac".
On April 1st 2011 he married actress Kato Koyuki who co-starred with him in Kamui Gaiden.