What could be an interesting plot in a Naruto Harry Potter crossover harem fanfiction?

Perhaps there could be a plot where a powerful dark wizard in the Harry Potter universe creates a spell that merges the two worlds. This causes chaos as ninjas and wizards start to clash due to misunderstandings. Naruto and Harry, realizing the danger, form a group of their friends from both worlds. They include Hermione, Ron, Sasuke, and Sakura. Together, they try to find a way to reverse the spell while also learning from each other. Naruto teaches the wizards about chakra control, and the wizards teach the ninjas about potions and magical creatures.

One possible plot could be a fem Naruto being somehow transported to the Harry Potter world. She might initially struggle to understand the magic system there as it's so different from chakra. But her ninja skills could come in handy, like her stealth and combat abilities. For example, she could help Harry and his friends during a dangerous mission at Hogwarts by using her unique fighting style.

Well, perhaps the magical creatures from the Harry Potter universe end up in the '300' setting. Dragons could be used by the Spartans to fight their enemies. The centaurs could also join the battle, lending their archery skills. And Harry could learn some combat skills from the Spartans, which he could then use back in the wizarding world to fight Voldemort's Death Eaters.

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.

Perhaps there is a prophecy in both the Naruto world and the RWBY world that speaks of a powerful being from another dimension (Naruto in this case) who will come and help balance the forces. Naruto arrives in the RWBY world with his harem - like entourage. The RWBY teams are assigned to work with Naruto's group. As they go on adventures, the RWBY girls start to admire Naruto's strength and his kind heart. Some of them might fall in love with him, leading to a complex web of relationships in this crossover fanfiction.

One idea could be that Harry Potter is transported to a different magical realm where he encounters characters from other stories in a harem - like situation. For example, he might meet characters from 'Lord of the Rings' and they all have to work together to face a new dark threat. Another could be that Harry's magic somehow combines with the powers of characters from a different anime - based magical world, and in the process, a harem of powerful female characters forms around him as they are intrigued by his unique magic.

Well, perhaps Harry Potter, with his knowledge of magic and a big heart, finds Naruto in the wizarding world. Maybe Naruto's chakra could be seen as a unique form of magic there. Harry could take Naruto under his wing, teach him about the wizarding ways, and Naruto could in turn show Harry some of his ninja skills. They could team up to fight dark wizards and evil ninja forces that somehow cross over into each other's worlds.

One possible plot could be that the Death Eaters in the Harry Potter world team up with the Akatsuki from Naruto. Harry and his friends, along with Naruto and his comrades, have to join forces to stop this powerful alliance. They could learn from each other's magic and jutsu. For example, Naruto could teach the wizards about chakra control, and the wizards could show Naruto some advanced spells for defense and offense.

One possible plot could be that the Smurfs accidentally find a magical portal that leads them to the wizarding world of Harry Potter. They could be initially confused but then start to explore. Maybe they meet Hagrid, who is fascinated by these small blue creatures. The Smurfs could use their unique skills, like Papa Smurf's potion - making skills, which could be a new and interesting concept in the wizarding world. And they could also get involved in some of Harry's adventures, helping him out in their own little ways.

One idea could be that Carly and her friends discover a magical portal in their apartment that leads to Hogwarts. They then have to navigate the wizarding world, with Carly being fascinated by all the magic. Meanwhile, Harry Potter and his friends are intrigued by the strange Muggle - like devices the iCarly gang has. They end up teaming up to solve a mystery that involves both the wizarding and Muggle worlds.