Shun Shirakawa is a third-year Star Course student at Amanogawa Academy and the dedicated goalkeeper for its Futsal Club. Standing 1.83 meters tall and weighing 72 kilograms, he possesses black hair, grey eyes, and maintains a meticulously neat appearance honed by his work as a young model. Born on June 28 with blood type O, his gentle, caring, and kind personality drives him to consistently show concern for everyone around him.

Within the Amanogawa team, Shun acts as a vital unifying figure, often described as the "mother" due to his nurturing nature. He treats younger players like younger brothers and extends this attentive care even to the team captain, Ren Kiryu, frequently worrying about Kiryu's well-being, eating habits, and self-care. Despite the team's strong individual personalities, Shun actively works to understand each member's uniqueness while striving to build cohesion. He resides in the school dormitory.

Shun shares a deep, longstanding childhood friendship with Kaito Kazanin and Sei Kyogoku from the Adalbert Futsal Club. Kaito, who lives nearby, has affectionately called him "Shun-nii" (Brother Shun) since they were young, and both Kaito and Sei regard him as an older brother figure.

His hobbies include photography ("camera") and appreciating nationwide crafts, while he possesses the special skill of waking up early. He enjoys big-sized rich ramen but dislikes the scent of perfume and has an aversion to coriander and celery. His given name "Shun" (瞬) means "wink, blink, or twinkle," and his surname "Shirakawa" combines "white" (白) and "river" (河).