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 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.
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 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.
Redemption is another one. The 'beast' character, whether it's a character from Harry Potter world who is in a similar situation or the actual Beast from Beauty and the Beast, often goes through a journey of redemption. For example, if a Slytherin character is in the role of the beast, they might learn to be a better person through the love of another. And this is similar to how the Beast in the original story learns to be more human. Also, the theme of magic is always there, whether it's the magic from Harry Potter or the enchanted elements in Beauty and the Beast, it's used to drive the story forward, like how spells might be used to break curses or create magical settings for the characters to interact in. This combination of themes makes the fanfictions really interesting as they blend two different but equally magical universes.
In fanfiction, the gun could be a magical - Muggle hybrid weapon. It could have been created by a wizard who was fascinated by Muggle technology. Harry gets hold of it, and it has unique properties. For example, it could fire spells instead of bullets, or the bullets could be enchanted to have special effects. This would blend the two worlds of magic and Muggle - ness in an exciting new way.
One way could be through a powerful ancient magic spell. A wizard discovers an old, forgotten spell that can summon and bind a Nemean Lion as a familiar. This spell might be hidden in a lost grimoire in a dusty corner of the Hogwarts library.
One way could be through a magical portal. Imagine a portal opening between the Naruto universe and the Harry Potter world. Shisui, with his Sharingan abilities, could be a unique addition. His teleportation jutsu might be mistaken for a new form of Apparition in the wizarding world. Also, his skills in combat could be put to use in battles against dark wizards. For example, his ability to quickly assess and counter an opponent's moves would be very useful in duels at Hogwarts.
The poisoned apple could be a gift sent by a mysterious figure to one of the characters, like Iron Man. When he touches it, it starts to release a dark magic that affects his suit's technology. Harry Potter then detects the magic and tries to find a way to reverse the poison's effects.
In fanfiction, Mother Earth could be a hidden force that has been dormant for a long time. But due to some great imbalance in the wizarding world, she starts to awaken. Harry Potter might be the one to first sense her presence, maybe through a strange dream where he sees the earth itself calling out for help. Then, as the story progresses, he discovers that Mother Earth can communicate with certain wizards, and she imparts her wisdom to him to help him fight against the forces that are causing the imbalance, such as over - use of dark magic that is harming the natural world.