Well, perhaps there could be a plot where Harry decides to take the One Ring on a journey to figure out what it really is. Along the way, he meets new characters from Middle - earth who help him understand the significance of the ring. They might teach him about the Dark Lord Sauron and how the ring is tied to his power. Harry, with his own experience in fighting dark forces, could then start to form a plan to either destroy or hide the ring from Sauron's reach.
One possible plotline could be Harry's initial confusion when he stumbles upon the One Ring. He might wonder about its strange power and how it seems to call to him in a way different from magic he's used to.
In this fanfiction, a really cool plotline could be that the magical world of Harry Potter and Middle - earth start to blend in some ways because of the One Ring. Harry might discover that the ring has an unexpected connection to some dark magic in his own world. Maybe it was brought there long ago by a wizard who was influenced by Sauron's power. As Harry delves deeper into the mystery of the ring, he has to not only deal with the threats from Middle - earth but also protect his own world from the new dark influence that the ring is starting to spread.
Well, perhaps Harry uses his magic to sense the One Ring's power. He might initially mistake it for a dark magical artifact from his own world. Then, he could start on a journey to figure out what this strange ring is, all while facing challenges from both the wizarding world (like Voldemort's followers thinking he has a new powerful weapon) and from Middle - earth forces that are also after the ring.
Obviously, Harry Potter would be one of the main characters. He is the one who finds the One Ring after all.
Well, in such a fanfiction, Naruto might be really confused at first. The One Ring has its own dark power and lore from Middle - earth, while Naruto is from the ninja world. Maybe Naruto would think it's some kind of super - powerful ninja tool at first. He might try to use his chakra on it, not realizing the corrupting influence it could have. And his friends like Sasuke and Sakura would be very suspicious of this strange new item Naruto has found.
Definitely Voldemort and Sauron. Voldemort would see the One Ring as a powerful tool to conquer the wizarding world completely. Sauron, on the other hand, would not want anyone else to have control over the ring. So they would both be after Harry and the ring, making them the main antagonists.
Perhaps Harry discovers a group of magical creatures that can communicate with him in a special way. These new friends introduce him to a whole new side of the magical world that he was previously unaware of. For example, they might show him hidden places where rare magical plants grow that can be used for powerful potions.
One possible plotline could be Harry struggling to adapt to the new social expectations of being a girl in the wizarding world. For example, she might face different treatment from her male friends at Hogwarts.
One possibility is that Naruto would try to incorporate the ring into his ninja gear. He's always looking for ways to get stronger. But the ring's power is not like normal ninja power. It could start to corrupt him slowly. For example, he might become more obsessed with power and less concerned about his friends' feelings.
Perhaps in this fanfiction, Draco Malfoy has a change of heart and is revealed to be the one who can truly end the dark reign. He might be in a unique position to infiltrate the Death Eaters due to his family's connections, and then use that knowledge to turn the tables on Voldemort. His Slytherin cunning could be used for good in this alternative scenario.
In some fanfictions, Hermione might find her parents in a dangerous situation. For example, they could be captured by dark wizards who are trying to use them as leverage against Hermione. This creates a high - stakes rescue mission for Hermione and her friends.
One common plotline is Severus becoming Harry's protector. He may start to train Harry privately to make him stronger. Another could be Severus confronting Harry's abusers, whether it's the Dursleys or others in the wizarding world.