A crossover could involve a magical pet from Harry Potter being transferred to the RWBY world. For example, a phoenix. The RWBY characters would be amazed by this magical creature. The phoenix could help them in battles against Grimm. It could also have a connection with one of the RWBY characters, like giving them the ability to rise from the ashes, literally or metaphorically, after a tough battle.
A pet could have unique powers that are useful in both worlds. Let's say a pet has the power of invisibility in the Harry Potter world. In the RWBY world, this power could be used to sneak up on Grimm or avoid detection by enemies. The pet could also form bonds with characters from both universes. For example, it could befriend Ruby and also get along with Harry, and through these relationships, bring the two groups of characters closer together.
It could be really interesting. For example, in this crossover, a wizard from Harry Potter might have a pet that has some characteristics of the Grimm from RWBY. Maybe a cat with the ability to sense approaching danger like a Grimm, and it could use its magic to protect its owner. The RWBY characters could be amazed by the magical pets from the Harry Potter world, and there could be some comical moments when they try to interact with these strange and wonderful creatures.
In the realm of RWBY fanfiction, the possibilities are endless. It's not unheard of for Harry Potter to be Ruby's pet. This could potentially lead to some hilarious scenarios. For example, Ruby might take Harry Potter (in his pet form) on her adventures in the RWBY world. He could use his magic in unexpected ways to help Ruby and her team out of tough situations, or maybe just cause some chaos in the process. The idea combines the magic and mystery of the Harry Potter series with the action - packed world of RWBY in a really novel way.
One idea could be that the Avengers are somehow transported to the wizarding world. They might be initially confused by the magic but then start to work with the Hogwarts students and teachers to fight a common enemy, like a dark wizard who has also harnessed some sort of Muggle - like technology to become even more powerful. For example, Voldemort could team up with Hydra remnants to create a super - weapon that threatens both the magical and non - magical worlds.
A fun concept could be a Transylvanian wizard coming to Hogwarts as an exchange student. This wizard has a pet dragon that is different from the ones in the UK. He brings with him knowledge of Transylvanian magic, like how to use the power of the full moon in a different way than British wizards do, which intrigues Harry and his friends.
One idea could be that the characters from Riverdale somehow find themselves in the wizarding world of Harry Potter. Maybe Jughead could be a Muggle - born wizard who discovers his powers while at Hogwarts. He might write about his strange new experiences in his journal, just like he does in Riverdale.
One idea could be that Loki, being the mischievous character he is, finds his way into the wizarding world of Harry Potter. He could start causing chaos in Hogwarts, perhaps by disguising himself as a student or a professor and playing pranks that are far more elaborate than those of the Weasley twins. For example, he might turn the entire Great Hall into an ice rink during breakfast time.
One idea could be that the Hulk somehow gets transported to the wizarding world. Maybe a magical experiment gone wrong by a Hogwarts student creates a portal. The Hulk's brute strength would be a shock to the wizards and witches. He could end up causing chaos in Hogwarts, knocking down walls and scaring students. Wizards would try to use spells on him, but his strength might make him resistant at first.
Another possibility is a scenario where Voldemort decides to expand his reach into the non - magical world and Batman becomes aware of this threat. He would then enter Hogwarts undercover to learn about magic and form an alliance with the Order of the Phoenix. The contrast between Batman's brooding, non - magical detective nature and the magical world would make for an interesting story.
One idea could be that Lucifer somehow ends up in the wizarding world. Maybe he's intrigued by the magic there and decides to play some tricks on the Hogwarts students. He could start by disguising himself as a new dark arts teacher, causing chaos in the classrooms.