Here is an gift for my sis Reshiram95 of her helluva boss oc Olivia. So Olivia is a hellborn succubus but their was an accident in her past in which lead to her wing's getting torn off, so most demons mistake her as a imp. Now she does have a human disguise like Loona but she doesn't use it often since she can go to the human world without the I.M.P crew and the book. But other than that i don't think Reshiram95 has made her story yet.