Yoku Shioya (塩屋 翼, Shioya Yoku) is a Japanese actor and voice actor debuting in Triton of the Sea (1972). He has also done some voice directing in anime, such as Basilisk: The Kouga Ninja Scrolls. His voice roles include Ryota Miyagi in Slam Dunk and Will A. Zeppeli in JoJo's Bizarre Adventure. His real name is Tsubasa Shioya (written with the same kanji). His older brother was voice actor Kōzō Shioya.
Source: “Yoku Shioya”, English Wikipedia (CC BY-SA 4.0), excerpt