Mitsuki Koga born January 16, 1975, is a Japanese actor who is known to be featured in films that involve much martial arts. He trained in Muay Thai, Karate and Boxing before starting his acting career.
Best known for his portrayals as Kyosuke Akiba in Godzilla: Tokyo S.O.S., Shinjiro Hayashida from Cromartie High - The Movie, and Tetsuki Yamato/Kamen Rider Ketaros in the 2006 Tokusatsu movie, Kamen Rider Kabuto: God Speed Love.
He was also featured as a main character in the film adaptation of Futaro Yamada's novel Koga Ninpocho, Shinobi: Heart Under Blade, And was a part of the stunt performers for The Last Samurai. He also recently made a minor/cameo role in The Fast and the Furious: Tokyo Drift as a Yakuza bodyguard.