- Some of the stories start with Suneo showing off some new video game or toy which evokes Nobita's envy. He has an extensive knowledge of science, and is a talented artist and designer.

- In some scenes, Suneo is seen as a narcissist who loves to stare at himself in the mirror while telling himself that he is the most handsome guy in the world. He is still a bed-wetter and needs to wear diapers when he sleeps, despite being in the fourth grade. He considers this humiliating habit his secret weakness.

- Suneo is also very self-conscious about his height, being the shortest kid in his class.