Ahriman

History
Also known as Angra Mainyu (meaning "absolute antithesis"), the chief evil spirit in Zoroastrianism. Comparable to the Christian Satan.

Appearances

 * Majin Tensei II: Jashin (Vile) clan
 * Shin Megami Tensei III: Nocturne: Tyrant

Shin Megami Tensei III: Nocturne
In Shin Megami Tensei III: Nocturne, Ahriman is the demonic sponsor of Hikawa that promotes Shijima. If the Demi-Fiend's ideals differ from Shijima, he must fight and kill Ahriman to continue. If the Demi-Fiend's Reason is Shijima, Ahriman lets him pass without conflict, giving him a necessary item as a token of good will.