Answer
Ryōtarō Okiayu is associated with the Slam Dunk series because he voices the character of Hisashi Mitsui. Mitsui is a high school basketball player who is initially portrayed as a hot-headed and arrogant player. However, he later becomes a more focused and determined player, and eventually becomes one of the top players in Japan. Okiayu's voice acting for Mitsui is praised for its ability to capture the character's complex personality.