Kenta Ishii, also known internationally as Kevin, is a male Japanese student and a core offensive player for the Kickers soccer team. He has black hair and black eyes. On the field, his notable abilities include securing possession of the ball, using tactical trickery, and executing powerful attacking plays. He frequently forms an effective partnership with his teammate Gregor, and together they score many goals.

Kenta possesses a highly volatile and impulsive temperament, which is a central aspect of his personality. He is easily provoked by opponents or any perceived disrespect toward his team, and this often leads him to lash out physically. His impulsive behavior tends to disrupt team play, and his teammates frequently have to restrain him. Although he is aware of the negative consequences of his anger, he struggles significantly to control it. His deep passion for soccer is fueled by a strong desire for victory and recognition. He displays a tendency to enjoy winning and has openly expressed a wish to crush his opponents. This ambition, combined with frustration over the team's difficulties, once led him to temporarily abandon the Kickers for a more successful team. This period tested his loyalty, but he ultimately chose to return, prioritizing the bonds of friendship and shared history with his original teammates over the promise of greater success elsewhere. This decision solidified the Kickers as a fundamental part of his life.

In the story, Kenta is a main player for the team, known for his aggressive, attack-focused style, which makes him one of its most capable members. His role evolves from a talented but volatile player to a committed leader. The original captain, Masaru Hongo, eventually graduates and formally designates Kenta as his successor, entrusting him with the leadership and responsibility of guiding the team forward. Kenta's key relationships are defined by both conflict and deep respect. His relationship with Hongo is complex; Kenta's hot-blooded impulsiveness frequently clashes with Hongo's more restrained personality. Despite these conflicts, they share a mutual respect rooted in their shared ultimate goal of team success, allowing them to set aside their differences when necessary. Kenta also exhibits fierce loyalty and a protective nature towards his teammates, confronting anyone who targets the Kickers.

Throughout the series, Kenta undergoes notable development. He strives over time to manage his temper and channel his intensity more constructively for the benefit of the team. His commitment to personal growth, particularly his struggle for greater self-control, is spurred by the importance the Kickers hold in his life. This development, along with his foundational skills, earns him the respect of his teammates, ultimately culminating in his appointment as the new captain.