What or who is Evelynn?

I've recently gotten into playing a lot of Evelynn. She's one of the very few assassins I enjoy playing, mostly because of her ability to stealth around the map and jump scare people. However one thing that really bothers me about her is...what the hell is she and what's her deal? I know she's an assassin for hire, but is she a mercenary? Does she work for anyone particular? Is she a succubus? Or a dark elf? Just curious what kind of direction Riot wants to take her.
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