Height 185 cm Nen Type Manipulation Illumi is Killua's eldest brother. He is an experienced assassin, whom along with his father was responsible for Killua's training and upbringing. During the Hunter Exam, Illumi masked his appearance and used an alias, using special pins to change his entire facial structure to the point where he could only be recognized by his voice. His oppressive evil aura makes even Killua fearful and wary whenever he approaches Illumi.