Suneo is a wealthy child who enjoys showing off his possessions to others. Despite having a fear and disdain for Nobita, he often bullies him with Gian's help. Some stories begin with Suneo flaunting new video games or toys that make Nobita envious. Suneo has expertise in science and is an accomplished artist and designer. He frequently invites Gian and Shizuka to events but leaves Nobita out, citing various reasons. In certain scenes, Suneo comes across as a narcissistic individual who enjoys admiring himself in the mirror while declaring himself the most handsome person on earth. Despite being in fourth grade, he still wet his bed and uses diapers when sleeping, which he considers a secret weakness. Additionally, Suneo is self-conscious about his height, as he is the shortest student in his class.