Hisashi Mitsui is a key character in the anime series Slam Dunk. Known for his exceptional three-point shooting skills, Mitsui is a former MVP of the junior high school basketball tournament. Initially quitting basketball due to an injury, he becomes a delinquent before rejoining the Shohoku High School basketball team. His character arc is one of redemption and resilience, as he overcomes his past mistakes and becomes a reliable player. Mitsui's determination and passion for the game significantly contribute to the team's success, making him an inspirational figure in the series.