Mephistopheles, also known as Mephisto, is a demon originating from German folklore, most notably as the chief devil in the Faust legend. He has since become a stock character in various artistic and popular culture works. Unlike other demons with roots in ancient mythologies, Mephistopheles emerged from late medieval European imagination. The name "Mephistopheles" is believed to be a corrupted Greek compound that means "not loving the light" or "not a friend of light". Another theory suggests the name is influenced by mephitis, a Latin word for noxious vapor.
In the Faust legend, Mephistopheles acts as the Devil's agent, offering his services to Faust in exchange for his soul. He is often portrayed as a trickster, liar, and negotiator, but also as intelligent, ironic, and charming. He is a master manipulator and shapeshifter, able to take any form he likes, sometimes appearing as a poodle. While not initially part of traditional magic or demonology, Mephistopheles has become a symbol of the modern Devil, appearing in literature such as Christopher Marlowe's Doctor Faustus and Johann Wolfgang von Goethe's Faust. In some interpretations, Mephistopheles is seen as the King of the Crossroads, ruling over demons who make deals for souls.