The second oldest of the Seven Sisters of Purgatory, Leviathan represents the sin of envy. She has a keen eye at spotting weaknesses due to her envious nature, serving her well as Furniture to Beatrice. However, it is said she can be more of a selfish crybaby then a person burning with envy.

Leviathan is voiced by Yonezawa Madoka and has a bit of a lower pitch, especially when she growls.