cold, arrogant, ironically indifferent, solves problems or relieves stress through violence against bad people. proud. family of murderers, high pain threshold, keeps emotions in check, but with friends allows themselves to relax and show their childish traits, mischief, arrogance and love of sweets, 12 years old. white hair, schoolboy, brave, capable, studies with average grades, likes to misbehave. his name is Killua.