Perhaps the Lycans could be introduced as an ancient and forgotten group in the Harry Potter world. In the fanfic, they start to rise as they discover a powerful magical artifact that was hidden long ago. This artifact could give them the power to break free from the oppression they've faced from wizards. They then have to face off against Hogwarts students and teachers who are initially afraid of their new - found power.
One possible interesting plot could be the Lycans forming an alliance with the werewolves in the Harry Potter universe. They might seek to gain more rights and recognition within the wizarding world. Since the Lycans are often seen as more powerful and organized than regular werewolves, they could use their strength to negotiate with the Ministry of Magic.
A half - Lycan, half - wizard could be a main character. They would be caught between two worlds, the Lycan pack and the wizarding community. This character would have to struggle with their dual identity and decide which side to support as the Lycans rise.
In fanfiction, lycans can be the key to unlocking hidden mysteries in the Harry Potter world. Their lycanthropy could be related to some ancient magic or prophecy. Maybe their transformation at the full moon has a significance that was not explored in the original books, and fanfic authors delve into these aspects to create engaging stories.
One idea could be that during a Quidditch match, a player gets seriously injured. Instead of using magic to heal right away, an ambulance from the Muggle world is called in by a confused bystander. The ambulance crew has to deal with the magical aspects they've never seen before while trying to transport the patient to a Muggle hospital. This could lead to a lot of comical and also tense situations as they try to figure out how to handle the situation.
One idea could be Harry using parkour skills to escape from the Death Eaters in the Forbidden Forest. He jumps from tree to tree, slides under fallen logs, and uses his magical abilities in combination with his newfound parkour skills to outmaneuver them.
One idea could be that Voldemort discovers the power of the Stargate and tries to use it to gain more power. He could send his Death Eaters through the Stargate to conquer other worlds and bring back resources or powerful artifacts to help him in his quest to take over the wizarding world. The Order of the Phoenix would then have to follow through the Stargate to stop him.
One idea could be a wizard discovers Beyblades in the Muggle world and decides to bring them to Hogwarts. He then challenges his classmates to Beyblade battles instead of duels. The different houses could form their own Beyblade teams and compete in a tournament, with the winning house getting extra house points and a special magical Beyblade as a prize.
One possibility could be that Supergirl somehow ends up in the wizarding world of Harry Potter. Maybe she's chasing a powerful magical artifact that has fallen into the wrong hands in Hogwarts. She could use her superpowers to help Harry and his friends during a particularly tough battle against Voldemort, like using her heat vision to fend off Dementors or her super strength to break through some dark magic barriers.
Maybe there's a prophecy in both worlds that foretells of a combined force from the wizarding world and the ninja world being the only way to defeat an ultimate evil. So, Naruto and Harry are brought together. They face challenges in understanding each other's cultures and powers at first. But as they train together, they find ways to merge their skills. For instance, Naruto's rasengan could be enhanced with a magical spell to create a more powerful attack.
One possible plot could be that Gaster somehow gets transported to the wizarding world of Harry Potter. He might initially be confused but then start to study the magic there. Maybe he tries to combine his own knowledge with magic, leading to some unique spells or potions. Harry and his friends could be both intrigued and cautious of this strange new character.
One possible plot could be a werewolf in the Harry Potter world who is trying to hide their identity at Hogwarts. Maybe they are a student who has to deal with the monthly transformations while also trying to keep up with their studies and avoid suspicion from the teachers and other students. They could form an unlikely friendship with Harry Potter, who helps them keep their secret and in return, the werewolf uses their unique abilities to assist Harry in his battles against the dark forces.