So sometime during the hiatus between Yesterday's Lie and Follies at the Coven Day Parade, I came up with an Owl House x Hazbin Hotel crossover. It featured Luz and the others trying to fine tune things so the next portal door would take lead to the human world instead of the In-Between Realm. Lilith and Amity were invited to come because the former was an academic and former head of the Emperor's Coven, and the latter works at a library and had access to a lot of books, so they were the most likely to have something regarding titan's blood.
Of course, things went wrong and brought the entire house to Hell, right next to the hotel, because convenient reasons. The hotel residents look to investigate, and see an out of place home with a long, brown tube stretching out to the city. They talk, Charlie agrees to help them find a way back to the Boiling Isles and Luz back to earth, and that's when Hooty comes back.
Unfortunately, I never really had any plans beyond this, besides maybe having the twins explore Hell and meeting Loona. I just wanted an excuse for a "What'd happen if Hooty met Valentino" joke.