Very long and straight black hair. Black eyes without pupils. Scary. Off-putting. Intimidating. Most often expressionless. He is generally a stony, ruthless person with an extremely cold way of thinking and reflects solely on his own interests. His face stays expressionless even when he speaks in an absent-minded and joyful way. Protective of Killua and his family. Has a desire for power. Controlling. Stoic. Emotionless. Very intelligent and cunning. Not above torture. Manipulative. Cold. Vile.