Louis displays many pathological personality traits that; include extreme cruelty, greed, arrogance, megalomania, lack of empathy and contempt towards others. He meets criteria for Narcissistic personality disorder; making him a psychopath. He was shown to be very vengeful and short-tempered, completely disregard human lives, willing to kill; even his own father, D'Artagnan and his loyal men. He is also very manipulative and dishonest, pretending to be nice towards others; in order to achieve hi