Lillin

Lillin Rystallus is the daughter of Lilith and Leviathan, a princess and prince of Hell.
First appeared in Season 2
Member of Ford's Squad
Due to confusion caused by Leviathan's jealousy aspect, she was at one time thought to be the child of Lucifer and Lilith.
Leviathan eventually realized during the The Tartarus War that she was his daughter.
Lillin as seen in Season 2 is part-succubus but painfully innocent of the world. This makes an uncomfortable mix for some who meet her.