Nishinoya is a very energetic and temperamental person. His boisterous nature and crazy shenanigans can attract unwanted attention quite easily, which often goes badly for him. Although he hardly ever worries about the consequences of his actions (and may even revert to violence to vent out his anger on certain occasions), he is surprisingly considerate of his friends' feelings and insecurities.

He has a quirky habit of spontaneously coming up with ridiculous names for the moves he executes while practicing receives. He is also unexpectedly shy when it comes to talking to girls he hasn't met before.