His genius-level intelligence makes him an absolute joy to watch and try to get into the mind of. Although Light doesn't fit all the criteria for psychopathy, he certainly matches enough of these traits to be diagnosed with this condition. While the majority of psychopaths might avoid long-term planning or arduous tasks, there are exceptions to this rule. He is intelligent, charming, and manipulative. Light's a utilitarian, he's willing to go extremely far to get what he wants.