Daemon

Although in classical mythology, a "daemon" is said to be a malevolent spirit, recent use of this name is almost certainly derived from a literary source.

In the "His Dark Materials" series by Philip Pullman, a "Daemon" is the word for the physical manifestation of a person's soul, which mimics the form of an animal.
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Daemon Sadi, son of Saetan SaDiablo, High Lord of Hell. Character from Anne Bishop's Black Jewels Trilogy; Warlord Prince, Black Widow and wielder of a Black Jewel.