Chikao Shiroyama, also known by his legal name Ken Shiroyama, was a Japanese actor and voice actor. Born on October 3, 1932 in Hokkaido, Japan, his career in the entertainment industry began in the early days of Japanese television. He graduated from Hokkaido Rumoi High School and later attended Waseda University's First Faculty of Literature before leaving to pursue his professional path. For many years, he was affiliated with the talent agency Production BAOBAB, and he worked extensively as a narrator in addition to his on-screen and voice acting roles.

His voice acting portfolio is substantial, characterized by a high volume of supporting and episodic roles across many popular anime series. In the mecha genre, he played the role of Gametsu, also known as Generale Gumez, in the 1976 series UFO Senshi Daiapolon. He was a frequent contributor to the Transformers franchise in Japan, taking on multiple roles in the 1986 OVA Transformers: Scramble City, including the characters Ratbat and Skydive. His work in this franchise extended to the original television series Fight! Super Robot Lifeform Transformers, where he voiced a wide array of characters such as Bombshell, Perceptor, Rumble, and Doctor Arkeville, as well as in the follow-up series and the 1986 film The Transformers: The Movie.

Beyond his science fiction roles, he held notable parts in several long-running and popular titles. He portrayed Kuroda and Shogo Sato in the supernatural tournament series Yu Yu Hakusho. He had roles in the Naruto franchise as the ninja tools inventor Gennou and later as the elder Ebizou in Naruto: Shippuden. He was the voice of Masayuki Ogami in the action series Kaze no Stigma, and appeared in the supernatural drama Berserk as a vassal. His film and OVA work includes the role of Dr. Meisel in Spriggan and Daisuke in Ninku: Tomb of Knives. He also had a recurring presence in the long-running detective series Detective Conan (also known as Case Closed), providing voices for various characters across multiple episodes.

In addition to his work in original Japanese animation, Shiroyama was active in dubbing foreign films and television series. A notable achievement in this field was providing the Japanese voice for the character Eustace Bagge in the dubbed version of the American animated series Courage the Cowardly Dog. His career was marked by a consistent and reliable presence in the industry, spanning from the late 1960s until his death on April 15, 2025. He remained active for over five decades, bringing his voice to a diverse range of characters across the history of Japanese animation.