Kengo Miyazawa, a core member of the Little Busters, debuts in the visual novel and anime *Little Busters!* before joining the crossover *Kaginado*. Standing 180 cm tall with gray hair and blue eyes, he forgoes the school uniform for his kendo attire, reflecting both disdain for conformity and unwavering dedication to the sport. After an arm injury, he switches to a red jacket bearing the Little Busters insignia. Undefeated in 100 kendo matches as school champion, Kengo projects honor, sophistication, and maturity, often serving as the group’s straight man ("tsukkomi"). This facade masks inner naivety and a fervent craving for fun and camaraderie. Though cynical, his loyalty to the Little Busters burns fiercely when his guard drops. He shares a volatile rivalry with Masato Inohara, sparking frequent physical and verbal clashes. Recruited as the fourth member after Masato, Kyousuke Natsume, and Rin Natsume best his father, Kengo initially endorses Kyousuke’s plan to prepare Riki Naoe and Rin for reality within an artificial world. Witnessing Rin’s mental collapse from the plan’s brutality turns him against Kyousuke. In *Refrain*, he argues for Riki and Rin to stay forever in the artificial world, convinced they cannot endure their real fate. He fakes an arm injury to prolong his time with the group. His resolve shatters after losing a critical baseball game to Rin, where he recognizes her growth. Defeat triggers an emotional breakdown; weeping openly, he regrets his deception, rejoins Kyousuke’s mission, and acknowledges Rin and Riki’s resilience. During a real-world school bus accident, Kengo shields Rin with his body, saving her life—an act underscoring his protective loyalty. His past reveals relentless kendo training under family pressure, which stole his youth and bred regret over lost friendships. This regret fuels his later obsession with preserving the artificial world to endlessly savor the Little Busters’ bond. In *Kaginado*, Kengo appears in chibi form among Key franchise characters. He engages in comedic moments, like teaming with Masato and Dorj in a baseball game against rivals from other series, retaining his core traits while adapting to the crossover’s levity. Kengo actively avoids Haruka Saigusa, exiting scenes when she appears. Side stories reveal Sasami Sasasegawa’s romantic feelings for him, and he briefly interacts with Miyuki Koshiki, visiting her grave in one narrative. His name combines "humble/modest" (謙) and "I/me" (吾) for "Kengo," while "Miyazawa" blends "temple/shrine" (宮) and "marsh" (沢). Notable quotes include: "You can find something else to live for. Even if you lose hope in doing one thing, you will find something you can do," and "Let me cry a little longer," revealing his philosophical depth and vulnerability.