Took a little break to indulge in my ancestral fandom! With the resurgence of Gravity Falls thanks to The Book of Bill, I've been inspired by the many new AU Bills to throw my hat and make my own- I'm cringe and I'm free
This is House Fae Bill! I made a truly massive text loredump for myself that I'm not going to add here for post length reasons, but let's just say I thought way too long and hard about this xD
TL;DR basic concept is- House Fae are a type of spirit-like fae that come from the woods and dwell in constructed homes! They start out formless, but develop a unique avatar with elements and iconography pulled from their chosen abode- and in Bill's case, it was the windows (that's right- in my AU, the windows happened first! xD). When a house fae possesses a home, it becomes their territory as well as their physical body. The influence of the fae is limited to the building itself and a very small margin around it (think the Unicorn Barrier from the show), but within the home itself, the fae can manipulate objects and architecture to achieve their goals. They also don't show themselves to the homeowners if they can help it, so Ford went a bit nuts for a while wondering who was organizing his nerd clutter all the time lmao
House fae are commonly mistaken for more well-known home-related fairies such as nisse/tomtu and brownies. In reality, house fae are a separate species in direct competition with these urban fairies. House fae, nisse, and brownies all have overlapping functions in the household, but house fae are extremely territorial and protective of their charges (homeowners and their families), and won't tolerate the presence of competing fairies who could pose a threat, unless absolutely necessary. House fae that lack sufficient influence may be forced to endure a reluctant roommate situation until they gain enough power to assert any kind of dominance.