So while Demons have many histories from around the world and i'm from the west my definition should keep my roots. So based on ancient and medieval Christian demonology, a demon "Me" is considered an unclean spirit, more specifically an "evil angel" (Mom used to call me this and still does), which may cause demonic possession, calling for an exorcism(tried and failed). A demon is a spiritual entity that may be conjured and controlled.

With that in mind... White (Wht for most games) Demon is my benevolent possession of my avatar. The extension of me that is fearless in battle because i will never perish, only be reborn in anew avatar.