In a Harry Potter and FNAF crossover, it could be that Voldemort discovers the power of the FNAF animatronics. He might try to use them as his minions. The animatronics, with their own strange powers, could be a new threat to the wizarding world. The Order of the Phoenix would then have to find a way to stop both Voldemort and the animatronics. This could involve a lot of magical battles and the use of both traditional magic spells and new strategies specifically designed to deal with the animatronics.
Well, maybe the Dementors in Harry Potter are somehow related to the animatronics in FNAF. The Dementors' ability to suck out souls could be connected to the animatronics' seemingly menacing behavior. A fanfiction could explore how the wizarding world's magic could either control or be affected by the FNAF animatronics. For example, could a Patronus charm work against them? And what if a character like Fred and George Weasley decided to prank with the animatronics, not realizing the real danger.
One possible plot could be that the Teenage Mutant Ninja Turtles somehow end up in the Freddy Fazbear's Pizza place. Maybe they are investigating some strange disappearances that are rumored to be related to the animatronics. They could use their ninja skills to navigate the dark hallways and face off against the haunted animatronics. The turtles' unique personalities would add a fun dynamic, like Mikey being scared at first but then finding the whole situation exciting, while Raph is ready to fight from the start.
Well, perhaps the magical creatures from the Harry Potter universe end up in the '300' setting. Dragons could be used by the Spartans to fight their enemies. The centaurs could also join the battle, lending their archery skills. And Harry could learn some combat skills from the Spartans, which he could then use back in the wizarding world to fight Voldemort's Death Eaters.
Well, it could be that one of the FNAF animatronics gets sent to the Loud House world by accident. Let's say Freddy. Freddy then starts to interact with the family. He might mistake the Loud family for the pizzeria staff. Lincoln and his sisters would have to work together to either fix Freddy and send him back or find a way to co - exist with him. The younger siblings like Lily might be curious about Freddy rather than scared at first, which could add a cute element to the otherwise potentially spooky crossover.
Obviously, Harry Potter himself could be a main character. He has the experience of dealing with dark forces, so he would be likely to take on the mystery of the FNAF animatronics. Hermione Granger would also be a key character as her knowledge of magic and books could help in understanding the situation. Maybe Freddy Fazbear could also be a sort of main character on the FNAF side, being the leader of the animatronics.
Harry Potter himself could be the main character. He has the experience of dealing with all kinds of dark and strange things, so he would be a natural fit to face the FNAF animatronics in the crossover. He could use his magic skills like the Patronus charm to fight against any dark influence the animatronics might have.
The Stargate could be a portal between different magical realms in the Harry Potter universe. For example, it could lead to a place where ancient and more powerful magic exists. Wizards from different schools around the world could team up with Stargate explorers to uncover the secrets of this new place. There might be a new threat emerging from this realm that requires both magic and Stargate technology to defeat. This would bring together characters like Harry Potter and Jack O'Neill to lead the charge against the common enemy.
Well, perhaps there's a rift in the multiverse that connects Central City to Hogwarts. The Flash, while chasing a villain, gets sucked into the wizarding world. Harry Potter and his friends initially suspect him as a threat but then realize his good intentions. They then combine their powers - the Flash's speed and the magic of the wizards - to fight a common enemy. For example, the Flash could use his speed to distribute protective spells all over Hogwarts really quickly, while Harry and his friends focus on the offensive magic against the bad guys.
One idea could be that Carly and her friends discover a magical portal in their apartment that leads to Hogwarts. They then have to navigate the wizarding world, with Carly being fascinated by all the magic. Meanwhile, Harry Potter and his friends are intrigued by the strange Muggle - like devices the iCarly gang has. They end up teaming up to solve a mystery that involves both the wizarding and Muggle worlds.
Well, perhaps the Death Note from the Bleach universe gets mixed up with the magic in Harry Potter's world. A powerful wizard could get hold of it and start using it in ways that disrupt the balance of life and death in both worlds. Harry and his friends would have to figure out how to stop this misuse, with the help of some Bleach characters who understand the true nature of the Death Note.
One idea could be that Eragon, while on one of his adventures in Alagaësia, accidentally creates a portal that leads him to Hogwarts. There, he meets Harry Potter and they quickly realize they have a lot in common. They could team up to fight against a dark force that somehow threatens both their worlds, like a new type of dark magic that combines the magic of Alagaësia and the dark arts from the wizarding world.