Hidetoshi Dekisugi is a recurring character in the Doraemon series, serving as a classmate and a notable contrast to the protagonist, Nobita Nobi. Born on April 14th, he is a ten-year-old student in Tokyo, Japan, with an O blood type. His surname is a pun on the Japanese word dekisugiru, which means to be overly accomplished or excellent, a name that perfectly foreshadows his defining traits.

As a character, Hidetoshi is defined by his exceptional and well-rounded abilities. He is an academic prodigy who consistently achieves perfect scores on his examinations and demonstrates a keen interest in subjects like astronomy and philosophy. Beyond the classroom, his talents extend to a wide range of physical and artistic activities. He is highly athletic, proving his skill in sports such as baseball, soccer, and track. He is also a capable painter, with a particular talent for realistic portraiture, an excellent cook, and even a proficient magician and performer of sleight-of-hand tricks.

Despite his many talents, Hidetoshi's personality is marked by a profound humility and a gentlemanly disposition. He never boasts about his superior abilities or looks down on others who are less capable. Instead, he is consistently kind, responsible, and encourages his peers to do their best. He possesses a rational and scientifically-minded worldview, often seeking logical explanations for phenomena and showing little belief in superstitions. While he is intrigued by Doraemon's futuristic gadgets, he is not easily mesmerized by them and rarely relies on their power to solve problems, preferring to use his own intelligence and diligence.

In the narrative, Hidetoshi's primary role is as a foil to Nobita, highlighting the latter's struggles and insecurities. He is also the object of affection for Shizuka Minamoto, leading Nobita to view him as a romantic rival. Shizuka and Hidetoshi share a close friendship built on mutual intellectual respect, frequently spending time together studying, reading, playing board games, or painting outdoors. Despite his own feelings for Shizuka, which he has admitted to, he does not treat his relationship with Nobita as a competitive rivalry. On the contrary, he consistently acts as a supportive friend. He helps Nobita with his homework, defends him from bullies like Gian and Suneo, and even secretly helped Shizuka bake a cake for Nobita's birthday. In one instance, when a jealous classmate named Gariben tried to sabotage his studies with harassing phone calls, Hidetoshi responded by forgiving him and offering to help him with his schoolwork.

Hidetoshi’s role within the larger story is distinct. Unlike the main group of characters, he is almost never involved in the central adventures that take place in the past or on distant planets using Doraemon's gadgets. Instead, he frequently appears at the beginning or end of these stories to provide valuable exposition, offering scientific or historical context for the phenomena the characters encounter. He serves as an anchor to normalcy and a source of real-world knowledge.

Looking toward the future, Hidetoshi's path remains successful and fulfilling. As an adult, he is shown to become an astronaut, often stationed on Mars for work. He marries and has a son named Hideyo. In the film Stand by Me Doraemon, he reveals to an adult Nobita that he had also wished to marry Shizuka but acknowledges that Nobita was the right person for her, demonstrating his continued integrity and graciousness even in adulthood. Hidetoshi Dekisugi remains a symbol of diligence, kindness, and natural talent, a character who achieves excellence not through magic or shortcuts, but through his own consistent effort and good nature.