Though he outwardly appears calm, "Gaara of the Sand Waterfall" is deeply unbalanced, completely unmoved by others' pleas for mercy and, in certain situations, driven mad with bloodlust. This behaviour is partly due to Shukaku, whose voice Gaara alone can hear in his head, who encourages violence at every opportunity, and who torments Gaara with threats to take control of his body if he falls asleep, thus making Gaara an insomniac. But Shukaku is not wholly responsible: Gaara simply hates other