Hidetoshi Dekisugi embodies exceptional talent, achieving perfect academic scores while excelling in baseball, soccer, and track. His diverse abilities extend to realistic painting, cooking, sleight of hand, and magic tricks. Despite these achievements, he remains modest and refrains from boasting, consistently displaying gentlemanly conduct by encouraging others and avoiding negative remarks. Dekisugi approaches life rationally, dismissing superstitions in favor of logical explanations, and shows only limited curiosity toward advanced gadgets while acknowledging their intriguing aspects. His appearance remains consistent across adaptations, marked by neat attire and handsome features that earn him recognition as his class's most attractive boy. His name reflects his capabilities: "Hidetoshi" means "unusual talent," and "Dekisugi" derives from "dekisugiru" ("over-achiever"). This perfection makes him a frequent target of envy, particularly from Nobita Nobi. Dekisugi shares a platonic friendship with Shizuka Minamoto, collaborating academically and enjoying casual activities like board games, outdoor painting, and cooking. In "Stand by Me Doraemon," he confesses romantic feelings to Shizuka, but she declines, believing he would not need her support—a decision reinforcing her eventual preference for Nobita. Though academically and romantically rivaled by Nobita, Dekisugi consistently shows him compassion. He defends Nobita against bullying by Gian and Suneo, emphasizing societal contributions over test scores. He discreetly assists Shizuka in baking Nobita’s birthday cake and maintains forgiveness when Nobita uses gadgets to undermine him, viewing Nobita as a friend despite jealous interference. When classmate Gariben sabotages Dekisugi with prank calls to disrupt his academic performance, Dekisugi responds to Gariben’s exposure and resentment by offering tutoring assistance instead of retaliation. In adulthood, Dekisugi becomes an astronaut, aligning with his scientific interests. He marries and fathers a son named Hideyo.