Naoki can be described as a serious and unfeeling person who is focused on taking action instead of expressing his emotions. He has a bored and tired expression, and is often seen wearing a white shirt with black tie. He has a fondness for luxury items, but is not a womanizer and has a soft spot for his girlfriend. He has a penchant for drinking and relaxing in a pool, and generally prefers to keep to himself and avoid socialization whenever possible.