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. Nishinoya can be extremely impatient, excitable and impulsive. As Tanaka puts it, "he simply gets too fired up for his good.". He doesn't bother to filter his words and is therefore prone to blurting out whatever he's thinking in a loud and tactless manner.