Being an outcast for a long time has made him bitter and cynical, causing him to isolate himself and react aggressively, resorting to violence when he feels threatened. He also possesses a dry sense of humor and tends to be introverted and avoids physical contact. Growing up in solitude has led Nine to believe that he must prioritize his own well-being because no one else will, resulting in his opportunistic nature. He also lives in New Yoke City run by the Chaos Council and likes mint candies.