Tiger beetle
Send massage.
Leviathan didn’t date Charlie. That was Seviathan, the son of the Von Eldritch family.
The Von Eldritches are basically lovecraftian abominations that just settled in Hell and became friends with the Morningstar family. There is a painting of both families in the Pilot:
Charlie calls the daughter, Helsa, a ‘loser’ in her song:
And you can spot their patriarch, Frederick, in one of the pictures in Lucifer’s workshop, in the series proper:
Leviathan probably doesn’t have any relation to them, unless they named their son after him? The most we know is that Leviathan and Satan are gonna have pretty traditional designs, so Lev is probably gonna be a sea serpent of some sort.
Genuinely, I sorta wish Viv renamed Charlie’s ex to something else, because I’ve seen people mix up the two all over the place. Some even mistaking that Frederick photo for Leviathan.