Kousei Hirota is a Japanese actor and voice actor born on February 12, 1951, in Fukuoka Prefecture, Japan. He is a graduate of Tamagawa University's Faculty of Literature and pursued his passion for performance by training at the Gendai Engeki Kyokai's School of Drama in 1974. He joined the En Theatre Group's research institute in 1975, becoming a full member in 1979, an affiliation he maintains throughout his career. His career in entertainment began in the early 1970s, with his foundation built on stage performances in productions such as Macbeth, Richard III, and A Midsummer Night's Dream, as well as appearances in television dramas.

Hirota is known for his deep, baritone voice, which has made him a frequent choice for authoritative, villainous, or fatherly characters in anime. Among his many anime roles are those listed in the query, including the Narrator in Legend of the Condor Hero, Araiguma in Kaze no Yojimbo, Guy Zelbert in Submarine Super 99, Alexandro Pecchino in King of Thorn, Dabi no ji in Musashi, Maeda Toshiie in Gifū Dōdō!! Kanetsugu to Keiji, the Roboworld President in Redline, and Allen in Ninjala. He is also widely recognized for his long-running role as Tequila in Detective Conan and has appeared in numerous other popular series, including One Piece, Cowboy Bebop, Full Metal Panic!, Naruto, and Higurashi: When They Cry.

Beyond anime, a significant part of Hirota's career is dedicated to dubbing foreign films and TV series. He is particularly renowned as the primary Japanese voice for American actors Danny Trejo and Ron Perlman. His dubbing work is extensive, covering a vast number of Western films and TV dramas for Japanese audiences. He has also lent his voice to video games, most notably as Marcus Fenix in the Japanese versions of the Gears of War franchise.

Hirota's career demonstrates longevity and versatility, spanning stage, television, anime, and video games from the 1970s into the 2020s. He has frequently collaborated with other voice actors over his long career, including performers such as Matsumoto Dai, Namikawa Daisuke, Yamaguchi Kappei, and Takagi Wataru. His special skills include playing the guitar and traditional Japanese drums, as well as speaking the Hakata dialect. While individual awards are not prominently listed, his enduring presence and significant contributions to the Japanese entertainment and dubbing industries are considered his notable achievements.