Neptune King is a prominent character in the anime series Kinnikuman. He is a Choujin, which are superpowered beings who participate in wrestling competitions. Known for his wisdom and strategic mind, Neptune King was initially a powerful antagonist who led the Perfect Choujin faction. His character is marked by a strong sense of pride and a belief in the superiority of his kind. Throughout the series, his role evolves as he becomes more complex, showcasing both his strengths and vulnerabilities, and ultimately contributing significantly to the storyline's depth.