Another idea is that a magical creature in the Harry Potter world, such as a centaur or a werewolf, could be the 'beast'. A witch or wizard, who has a kind heart like the 'beauty', tries to understand and help this creature. Through their relationship, which might start with fear and misunderstanding, they gradually grow closer, and the story could follow the themes of acceptance and love from Beauty and the Beast.
It could also be a parallel universe type of fanfiction. In this alternate world, Hogwarts could have a similar situation to the Beauty and the Beast story. The Forbidden Forest could be home to a 'beast' who was once a wizard but cursed. A brave 'beauty' from Hogwarts, perhaps a Gryffindor, decides to venture into the forest and befriends the beast, leading to a series of adventures and a possible breaking of the curse.
One way could be through a magical spell gone wrong. Maybe a spell that was meant to transform an object into a helper, like in Beauty and the Beast, but instead it affects a character in the Harry Potter universe in a similar way. For example, a student might be turned into a beast - like form and only the love of another can break the spell, much like in the original Beauty and the Beast story.
Well, perhaps the avalanche is caused by a powerful dark magic that also disturbs Sleeping Beauty's slumber in a distant realm. Her enchanted castle could be transported to the outskirts of Hogwarts during the chaos. And when Harry and his friends discover her, they're amazed by her beauty and the strange magic that surrounds her.
One way could be through a crossover spell. Maybe a powerful dark wizard in the Harry Potter universe discovers a way to create a Rinnegan - like power. They might use it to gain ultimate control over magic, similar to how the Rinnegan gives great power in Naruto. This could lead to a new kind of threat that Harry and his friends have to face.
The idea of the outsider is present in both. Belle was an outsider in her village, and Harry was an outsider in the wizarding world at first. In a fanfiction, a new character could be introduced who is an outsider in both the Beauty and the Beast world and the Harry Potter world. This character could be the link between the two stories, trying to find their place and in the process, bringing the two worlds closer together.
One idea could be a story where Hermione is transported into the world of Beauty and the Beast. She could use her magic to break the curse in a different way than in the original story. For example, instead of falling in love with the Beast right away, she tries to find a magical solution using her knowledge from Hogwarts.
Perhaps the Chaos Emeralds are hidden in different wizarding schools around the world, and in the fanfiction, a quest is set up for Harry Potter and his friends to find them all. Each emerald could grant a different ability, such as the power to control the elements, which could be used against the rising dark forces in the wizarding world.
He could be incorporated as a long - lost relative who was banished from the family due to his dark and strange magic. His return in the fanfiction could stir up old secrets and rivalries within the Black family.
One way could be that the Infinity Stones are hidden artifacts in the wizarding world. Maybe they were created by an ancient and extremely powerful wizard long ago, and their powers are so great that they are feared and thus hidden. For example, the Time Stone could be related to time - turners, but with much more powerful time - manipulating abilities.
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.
Perhaps the lemon is used in a Hufflepuff - themed spell. Helga Hufflepuff might have created a spell that uses a lemon as a focusing object. Harry Potter, during his adventures, finds a torn page of an old spellbook that mentions this spell. He then has to figure out how to complete the spell with the lemon and in doing so, he uncovers more about Hufflepuff's unique magic. This could involve interactions with Hufflepuff ghosts or descendants who know more about the lemon - related spell.
Well, perhaps there's a special kind of magic in the far - flung corners of the wizarding world that allows for the creation of very unusual familiars. Harry, being the special wizard he is, might be drawn to this magic. The dinosaur could start as an egg that Harry discovers during one of his explorations. He then nurtures it with his magic, and as it hatches, it forms an instant bond with him. This dinosaur could have unique abilities that are useful in the wizarding world, like being able to sense dark magic from miles away or having the ability to camouflage itself in the Forbidden Forest.