Lucifer Morningstar is a fallen angel, the father of Charlie and the estranged husband of Lilith. He is the ruler of all of Hell and one of the Seven Deadly Sins, embodying the sin of Pride.

Despite his status as the ruler of all of Hell, Lucifer possesses a grandiose and dramatic nature, acting very over-the-top in most situations. He often switches between being silly and theatrical to awkward and melancholic. Like Charlie, Lucifer is ambitious in what he believes in. As a father, he falls short of expectations. Although he loves Charlie dearly, he seems to be preoccupied with his own problems. He seldom calls Charlie, and when he does, it's usually because he's bored or needs something. While he is the King of Hell, Lucifer hardly rules over his subjects and leaves them to their own devices. Although he understands his daughter's interest in rehabilitating Sinners, Lucifer is cynical about the idea of trying to save any of them, as he attempted to redeem sinners in the past. Lucifer is fiercely protective of Charlie.