Hey everyone, I just figured something out and it doesn't fit into the main site but I'm excited and I wanted to share!
D&D divides its Fae creatures boadly into a Seelie Court and Unseelie Court, based off the Scottish folklore IIRC. In my world, I wanted to keep that general division of "will actively murder you for sport" versus "will probably only steal your firstborn if you make a pact with them", but wanted to find a way to be constructive & creative about it rather than a derivative copy.