Hulder
I had a long, difficult time figuring out what, exactly, fairies are. Undead are straightforward- When you die in a certain way, you may become an undead. The precise details of what decides who becomes undead are still a bit beyond me, but every Undead was once a human, and it’s not such a mystery where the first one came from. Demons, likewise, are a bit less of a mystery, now that I know a couple individuals. An animal who is the focus of attention for a human can become one of them. But fairies… a human can become a fairy, if, before they become an adult, they are raised by a fairy. So where the hell did the first fairy come from?