Kōji Yamamoto has appeared in 13 movies.
These include Kagerô Ezu, Promise of death, Vampire Island, The Last Ronin, A Flawless Concierge, Shin Ultraman, Startup Girls, Galaxy Turnpike, A Ghost of a Chance, Pokémon: The Rise of Darkrai, Ninja Kids!!!, Fullmetal Alchemist: The Final Alchemy and The Magic Hour.Kōji Yamamoto has appeared in 9 TV Series.
These include Pandora, Torrent~Do You Remember Me?, Pin to Kona, An Incurable Case of Love, The History of Our Family, Ashita no Nadja, BOSS, Doctor-X: Surgeon Michiko Daimon and Kamen Rider.