is a character in the Soul series of fighting games. The evil alter-ego of , he later becomes an entity separated from Siegfried in Soulcalibur III. Nightmare first appeared in one of the possible endings for the Siegfried character in the game Soul Edge. In the sequel Soulcalibur, he was given a name and featured as a central character. Ever since then, Nightmare has been the main antagonist and owner of the Soul Edge, and thus the objective of most other characters in the story. Appearing in every game of the series, Nightmare has served as a recurring antagonist in contrast to the protagonist role played by Siegfried, as well as serving as Siegfried's archenemy.
Nightmare has appeared in all the sequels to Soulcalibur, visually different for each game. His fighting style was altered from Soulcalibur II to Soulcalibur III because Siegfried was now a distinct character in terms of both gameplay and story.
Even though Nightmare originally debuted on "Soulcalibur", its predecessor, "Soul Edge", featured a prototype of his character. In the home version, an extra character named "Siegfried!" was added as an unlockable character. "Siegfried!" was an alternate version of normal Siegfried taken from his no-input ending, where he was consumed by Soul Edge. This early version was much different from the former Nightmare, having crimson armor and a more flesh-like design, almost as if he were part of Soul Edge itself. He has no story nor ending, and only used Siegfried's Soul Edge without effects.
In soulcalibur 2 some how Nightmare dies and in the 3 soulcalibur he is brought back to life by abyss in human form
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Official Site: Namco
Links: Wikipedia: Nightmare SoulCalibur.com: Nightmare Namco's Official Soul Calibur Site