One Door Closes Another Opens
is a Percy Jackson and the Olympians and The Owl House crossover by Huntingkiddo13. In this AU, Percy ended up in Gravesfield after blowing up Mt Saint Helens, on a completely different Earth, and is taken in by Camila after she finds him, struggling to adjust to a world without monsters and his friends. And then he follows Luz to the Boiling Isles...
- Absence of Evidence: Both Camila and Principal Hal are worried by how they can't find any record of Percy existing prior to him ending up in Gravesfield.
- Big Brother Instinct: Percy has quickly become rather protective of Luz, getting in front of her when he realizes that Eda isn't human.
- Education Mama: The reason why Boscha is such a mess is because of her mother's impossibly high academic standards in potion-making.
- Exact Words: Percy casually mentions his dad mysteriously vanished before he was born when Eda starts to wonder about his ability to cast magic in spite of being seemingly human. If it leads her to conclude the teen was the product of a witch and a human having a relationship, it's on her.
- Expelled from Every Other School: Percy's demigod Weirdness Magnet status has led to him getting expelled numerous times over incidents that weren't really his fault, to the point that he's come to expect it as a default punishment.
- For Want Of A Nail: In canon, Percy triggering Mt Saint Helens to erupt resulted in him landing in Calypso's lap. Here, it sends him to the Earth of the Owl House, not long before Luz finds her way to the Boiling Isles.
- Half-Human Hybrid: Eda correctly guesses Percy manages to cast powerful magic because he has supernatural ancestry. However, she assumes his father was a witch because divine magic was last seen centuries ago.
- Reasonable Authority Figure: Principal Hal, as he's worried about Percy's issues and his past, and is rather surprised to learn that Percy assumed that he'd be expelled after just a couple relatively minor incidents.
- Trapped in Another World: Somehow in this story, Percy blowing up Mt Saint Helens catapulted him into the Owl House's version of Earth, specifically Gravesfield, where he's taken in by Camila.
- You Remind Me of X: Percy ultimately accepts Amity's invitation to a Moonlight conjuring because her eyes were far too much like Nico's, and he doesn't want to fail yet another kid.
