Sullivan seems to act rather childish at times. For instance, he is quick to cry when his daughter Kurotsuno tells him to leave and when Glasses later drags him away. He is furthermore very affectionate towards his daughter and easily cries when she is cruel to him. It seems he also can be violent and often gets into confrontations with Gyakuten. It has been stated that Sullivan, "ain't got the best temper," a trait he shares with his daughter. He is also a helicopter parent.