Illumi is most often expressionless. He has very long, jet black hair. Black, pupil-less eyes. Illumi is calm, introvert and cold. Very stoic. He believes firmly in the Zoldyck rule that "assassins don't show emotions". Still, he holds a twisted and overprotective form of love for his younger brother, Killua. Very possessive. Highly manipulative. Smart. Illumi cares for the Zoldyck Family members. Slim and tall body, kind of feminine appearance. Trained to be an assassin since birth. Eldest son.