Nobio has black hair and eyes, is about average height and when first seen, wears a red shirt and yellow shirts and is carrying a small bag. Later he is seen wearing a light blue shirt.
Nobio is seen to be kind-hearted, naive and looks up to Nobita. He is also apparently afraid of dogs.
Nobio looks up to Nobita like an older brother. He was heartbroken when he learned they were moving away from Tokyo.
- Nobio's personality is a lot like Sunetsugu's, who is also naive, kind, and has great respect for Suneo. Similar to Suneo, Nobita also lied about certain things to Nobio like personally knowing a famous wrestler, and Nobio believed every word, just like Sunetsugu did.