Nope.. Neither.. But "any" monster could be a maid..
Imagine a guy who made the contract with the Demon but then turned into an Alp and was then "forced" to dress and serve as a maid, by the Demon, because the Demon knows that even though she is in denial about it, she actually likes it... And this Alp Maid looks and is dressed a bit like Rem from ReZero... (with succubus horns, tail and wings of course..)