Lucifer Morningstar

'Information found online is most likely outdated. All information is to be changed following theory debunk streams, upcoming Patreon comics, and the pilot.'

Satan is Charlie's father. He can be seen in multiple pictures along with Charlies mother and Charlie herself in the background of the "Let's Misbehave" clip.

Trivia

 * The apple tucked in the brim of his hat seems to reference the story of Adam and Eve where a talking snake (often interpreted as being the Devil) persuades to first woman Eve into eating a forbidden apple, resulting in her and Adam being thrown out of paradise.
 * Satan's character originates from Abrahamic Mythology where he is typically portrayed as being the fallen-archangel Lucifer who attempted to conquer heaven in a great war before being cast down to Hell where he became it's ruler and the adversary of god.