What are some interesting plot ideas for a Harry Potter Fantastic Beasts crossover fanfiction?

One idea could be a story where Newt Scamander's magical beasts escape into Hogwarts. The students and teachers have to work together with Newt to recapture them. It would be a chaotic yet fun scenario as the beasts interact with the Hogwarts environment and its inhabitants.

One idea could be exploring the backstory of a minor character from the series in the fanfiction. For example, delving into the early life of Luna Lovegood's father. Another could be a story where a new magical creature is discovered in the Forbidden Forest and how the Hogwarts students interact with it. Or perhaps a fanfiction where the events of the Fantastic Beasts movies intersect more directly with the main Harry Potter storyline, like Newt Scamander visiting Hogwarts during Harry's time there.

One idea could be a crossover with the Harry Potter universe. For example, Newt Scamander could meet Harry and his friends and they could go on an adventure together to find a new and extremely dangerous fantastic beast that has escaped from Newt's case. Another idea is a crossover with a historical fantasy world, like Camelot. Newt could travel to Camelot and help King Arthur's court deal with a magical beast that is terrorizing the kingdom.

Harry Potter and Tina Goldstein would make a great pair. Harry is used to dealing with dark wizards and the secrets of Hogwarts, and Tina is a strong Auror in the Fantastic Beasts world. They could combine their skills to solve a mystery that involves both their worlds. For example, a dark force that is using magic from both Hogwarts and the Fantastic Beasts world to achieve its evil goals.

A plot could involve Ciel Phantomhive being magically transported to Hogwarts. Since he's used to a world of mystery and intrigue in his own story, he might quickly adapt to the secrets of Hogwarts. He could form an unlikely alliance with Harry Potter and his friends, and together they face a new threat that combines elements from both universes, like a dark wizard who has made a deal with a demon.

Perhaps the wizards from Harry Potter could teach the Avengers some magic. For example, Harry could show them how to use the Patronus charm for protection. In return, the Avengers could introduce the wizards to their high - tech gadgets. Iron Man could be especially interested in the magical properties of things like the Elder Wand. And then there could be a big battle where the combined powers of magic and technology are used to fight off a new, powerful enemy.

One idea could be that Harry Potter and his friends accidentally end up in the world of My Little Pony. They could learn about the magic of friendship in Equestria, which is different from the magic they know in the wizarding world. Maybe they help the ponies fight a dark force using their unique spells.

One idea could be that the vampires in Twilight are discovered by the wizarding world in Harry Potter. The wizards might be intrigued and cautious at the same time. They could study the vampires' immortality and special abilities, while the vampires might be interested in the magic that wizards possess.

In a crossover, Merida could teach the Hogwarts students about her own form of magic, like the spells she uses for her archery and how she communicates with the animals in her world. At the same time, she could learn about the complex spells and potions of the wizarding world. This exchange of knowledge could lead to some exciting adventures, like using a combination of both types of magic to defeat a common enemy.

One idea could be that the Hogwarts students discover Halo technology. Maybe Harry and his friends find a crashed UNSC ship and start to study its advanced weaponry and shields. They could try to adapt the technology to defend Hogwarts from Voldemort. Another plot could involve Master Chief being sent to the wizarding world by accident. He then has to navigate the strange new world of magic while also dealing with threats that his usual Halo combat skills might not be fully equipped for.