Hikaru Uesugi is the goalkeeper and leader of the dominant Nanyo SC secondary school soccer team, the Red Devils. Renowned as an exceptional goalkeeper, he is considered undefeatable due to extraordinary reflexes and an uncanny ability to stop shots from any position or technique. Scoring against him is a significant feat, exemplified when Kakeru Daichi of Kitahara Elementary managed a single goal in a 10-1 loss to the Red Devils.

Beyond his playing role, he mentors the Kickers, providing training advice, strategic tips, and motivational support, crucially aiding their skill and morale development. Despite competitive intensity, he maintains respectful sportsmanship towards opponents, acknowledging their efforts and never underestimating them, even with a significant lead. He views Kakeru as a worthy rival, fostering a friendly rivalry.

His character design features long, dark hair and a pale complexion, contributing to a composed and distinctive presence. While his original manga role is limited, the anime significantly expands his presence, positioning him as a central rival to Kakeru with increased screen time. He has a younger sister, Akuna Yukie, whose romantic involvement with Kakeru adds a personal dimension to his connection with the protagonist.

Personality-wise, he is consistently respectful and encouraging to both teammates and opponents. He emphasizes fair play and maintains intense concentration during matches regardless of the opposition's perceived strength. His leadership extends from his defensive position, motivating his team and ensuring they remain focused and disciplined throughout games.