Main antagonist of the Soul series. He made his first appearance in Soul Edge, with his proper debut being in SoulCalibur. With the nom de guerre of the "Azure Knight," he is the host, wielder and living incarnation of the cursed sword, Soul Edge.
Nightmare appears as a violent and ruthless creature covered in dark blue armor. His prominent feature is his right arm, which has been twisted and transformed into large three-digit claws whose flesh overlaps his entire right arm and shoulder. He is depicted with Soul Edge in his left hand, symbolizing his polarity with Siegfried. Over the years, his appearance has progressively grown more and more demonic, as influenced by the state of Soul Edge itself. When unable to take possession of a corporeal body, Soul Edge can form Nightmare as a sentient suit of armor, though this is a desperation tactic.
