Koji Yusa is a Japanese voice actor and narrator born on August 12, 1968, in the Fushimi-ku ward of Kyoto City, Kyoto Prefecture. His interest in voice acting was sparked during his childhood after receiving a boombox as a gift for entering junior high school, which allowed him to listen to radio dramas. He later majored in Japanese language studies at university. Following his graduation, he trained at the Katsuta Voice Actor Academy as part of its seventh class and made his professional debut as a voice actor in 1993. His first anime role was in the series The Brave of Gold Goldran.

At the start of his career, Yusa was affiliated with the talent agency Office Kaoru. He eventually left the agency to work as a freelancer, a status he maintains to expand his creative opportunities. His work is extensive and covers anime television series, drama CDs, video games, and dubbing foreign films. He is also frequently engaged as a narrator for information programs.

Yusa has built a reputation for his versatile vocal range, frequently portraying characters who are charismatic, intelligent, or carry an enigmatic and sometimes antagonistic edge. One of his most iconic and long-running roles is that of Gin Ichimaru in the popular anime Bleach. He is also internationally recognized as the voice of Shadow the Hedgehog in the Sonic the Hedgehog video game and anime series. Another highly notable performance is his role as Urataros, one of the Imagin, in the tokusatsu series Kamen Rider Den-O. For this performance, he was a recipient of the Synergy Award alongside his fellow cast members at the 2nd Seiyu Awards in 2008.

Throughout his career, Yusa has taken on a wide variety of roles in long-running and well-known franchises. He has appeared multiple times in the Detective Conan series, voicing characters such as Soshi Okita and many others in various episodes and films. In the world of sports anime, he is well known for his portrayal of the uniquely intense cyclist Akira Midousuji in Yowamushi Pedal and its sequels. He has a long association with the Hakuōki franchise, providing the voice for Sanosuke Harada across numerous series and films. He also voices the calculating Yuri Petrov, also known as the villain Lunatic, in the superhero series Tiger & Bunny.

His filmography includes a vast array of other significant roles. He has voiced Lau in Black Butler, Kyōsuke Hyōbu in Zettai Karen Children and its spinoff The Unlimited, Brain Unglaus in the Overlord series, Farlan Church in the Attack on Titan: No Regrets OVA, and Renzo Shima in Blue Exorcist. He has also been a recurring presence in the Transformers franchise, voicing characters such as Ironhide in Transformers: Armada and Energon, as well as Jazz in the Q Transformers series.

Yusa continues to be an active and prominent figure in the voice acting industry, consistently taking on new roles in contemporary anime. His ability to bring depth and nuance to a broad spectrum of characters, from charming rogues to formidable villains, has established him as a respected and enduring talent in Japanese animation and beyond.