Leviathan

Leviathan is one of the Seven Deadly Sins, embodying the sin of Envy. From what little has been seen, Leviathan's right head is more cynical and in more control of the main body. She dislikes Mammon and finds him annoying. Leviathan's left head, on the other hand, is more friendly to Mammon and seems to genuinely enjoy being around him. She even gets mad when the right head moves them away from him. Not much is known about Leviathan's history other than at some point she joined Lucifer as part of the Deadly Sins, with her embodying the sin of Envy. She’s has two head, Left head is Eel and right head is Siren.