Like most members of his family, Niji is proud of his royal status, looking down upon and even abusing commoners and servants. Since birth, Niji has lacked the ability to feel empathy and sympathy due to the genetic modifications done by his father. He is outspoken and quick to anger. He has also exhibited petty and vindictive behaviors. Furthermore, Niji's emotional detachment is so strong that he was unmoved by even the prospect of his own death, as well as that of his family.