Kousuke Okano is a Japanese voice actor and narrator born on October 14, 1969, in Tokyo. After graduating from high school, he worked at a bookstore before deciding to pursue a career in voice acting. He enrolled in the Tokyo Broadcast Academy, where he trained under the tutelage of veteran voice actor Hiroshi Masuoka. His career began in the mid-1990s, with one of his earliest roles being Dai Suganuma in the 1995 series The Brave of Gold Goldran. Over the years, he has been affiliated with several talent agencies, including Production Baobab and Still Wood Garden, and as of 2018, he is represented by SSP.

Okano has built an extensive and versatile portfolio across anime, video games, and dubbing for foreign films. He is known for a wide vocal range, capable of portraying both spirited young heroes and more nuanced supporting characters. A significant long-running role is that of Rikichi Yamada in the beloved series Nintama Rantaro, a character he has voiced for decades. He also took over the role of Yamada's father, Rikichi's dad, from the late Masato Tsujimura. In the racing anime Initial D, he is a regular presence as the character Kenta Nakamura across multiple stages and adaptations of the series.

Many of the specific roles mentioned are indeed part of his filmography. He voiced the protagonist Recca Hanabishi in Flame of Recca and Asuka Jr. in Saint Tail, both from 1997 and 1995 respectively. His role as Naoto Fujiwara is confirmed in the 1999 film Happy Birthday: The Time When Life Shines. In the early 2000s, he voiced Hot Rod in the Transformers: Armada series. His work in the Hiiro no Kakera franchise as Mahiro Atori began in 2006 with the game and continued in the 2012 anime adaptation. He also voiced Kazuya Matsui, known in English as Kazuya Narutoki, in the anime Angel of Darkness (GTO). Other verified roles include Aqua in the Jewelpet Kira☆Deco—! series, Speedman No. 1 in Tottemo! Luckyman, Takumi Watabe in Doki Doki School Hours, and Mau Sakisaka in the 1998 OVA Virgin Fleet. He played Paf, also known as Kiramekiman #2, in Kaitō Kiramekiman, Albitro in Togainu no Chi, and Kelp in Gargoyle of Yoshinaga House. His role as Son Goku is in the 1999 OVA adaptation of Saiyuki, and he voiced Osamu Yasuhara in the 2007 anime Ghost Hunt. He is also credited with the role of Charlie in Silk Road Kids. The role of Ireba-kun (also listed as Dentures) in the series Wasimo is confirmed in later episodes from 2014. The provided list also includes the character Kenta Kogure, which is likely a reference to his role in the Initial D franchise, where he plays Kenta Nakamura. The role of Matagoro Yoshimura in a series titled Samurai XXX could not be verified against his standard filmography and may be a reference to work done under an alias or for a different medium.

Beyond anime, Okano is highly active in the field of dubbing foreign films and television series. He has provided the Japanese voice for actors such as Elijah Wood in The Faculty, Adam Brody in The O.C., and Ken Jeong in The Hangover films. His dubbing work also extends to animation, where he has voiced characters like Scrappy-Doo in the live-action Scooby-Doo film, Major Glory in Dexter's Laboratory, and Carnage in various Spider-Man animated series. In the video game world, he is known for roles such as Mahiro Atori in the Hiiro no Kakera games and has contributed to major franchises like Super Robot Wars. For work in adult-oriented games and anime, he uses the alias Masaru Hishi. His voice has been noted for its similarity to the late voice actor Chikao Otsuka, which led to him being chosen to take over some of Otsuka's roles, such as in the game for High School! Kimengumi.