Sho Utsumi is a first-year high school student in Tsutsujidai and a founding member of the Gridman Alliance. He stands 176 cm tall, weighs 78 kg, and was born December 1, 2002. His appearance features teal hair extending to his neck, blue eyes, and transparent-framed glasses. His typical attire includes a blue shirt displaying a purple slashed "8" insignia referencing Transformers Shattered Glass Sideswipe, a white overshirt, black pants, and blue-and-white sneakers; "Turbo" text decorates his bag strap. Initially laidback and optimistic, he reacts casually to friend Yuta Hibiki's amnesia and enthusiastically embraces forming the Gridman Alliance after witnessing Gridman battle a kaiju. His extensive tokusatsu knowledge, particularly of the Ultra Series, proves strategically vital; he identifies Ghoulghilas's weak spot by its flaking neck skin and deduces kaiju behavior patterns based on genre conventions. This expertise fuels his initial excitement during attacks, though he remains more grounded than his allies. Significant emotional conflict marks his development. Learning that kaiju battles cause real casualties and damage, especially during the climax against Alexis Kerib, sparks disillusionment and guilt over his prior enjoyment. This culminates in a hospital scene where he refrains from attacking Anti despite holding him responsible for lives lost; self-disgust churns within him over his earlier enthusiasm. His relationship with Akane Shinjo is complex; he admires her as "unapproachable" and a "miracle girl," with narrative hints suggesting unacknowledged romantic feelings. When Akane directly questions him about Yuta, he evades her inquiries but later doubts Yuta's revelations about Akane's role until visual evidence surfaces. Key interactions demonstrate loyalty and occasional forcefulness. He nearly disbands the Gridman Alliance following Gridman's temporary defeat but recommits after reassurance. He clashes with Rikka Takarada over confronting Akane during the Mecha Ghoulghilas incident but later apologizes while dressed in a French maid outfit for a school festival. Trapped in Bujack's dream world devoid of kaiju attacks, he bonds with Akane over shared Ultra Kaiju interests yet recognizes the illusion, lamenting their unrealized potential friendship. In the finale, he pleads with Gridman-inhabited Yuta not to pursue Akane due to safety concerns and requests to be Gridman's next host to avoid future farewells. His abilities evolve. After Samurai Calibur optimizes Gridman, he gains Yuta's exclusive capacity to perceive distant kaiju. He also briefly sees Gridman on the Junk computer post-Ghoulghilas, though without auditory communication. Beyond his genre-savvy tactical insights, he exhibits no supernatural powers. Trivia includes recurring Ultra Series reference gags, binoculars modeled after Transformers' Longview, and episode 5 highlighting his slightly "pudgy" physique. Voice dramas suggest voice acting aspirations, though this may function as a cover for Gridman-related incidents.