One idea could be that Harry comes back with new magical powers. Since he has faced death, he might have a deeper understanding of magic that was previously unknown. For example, he could have the ability to communicate with the dead more freely, which would help him solve mysteries related to the wizarding world's past.
Another plot could be that Harry's return is part of a bigger prophecy. His resurrection is not just a random event but is tied to the fate of the entire magical universe. He might have to journey to different magical realms to discover the true reason for his return and along the way, make new allies and face powerful enemies.
Perhaps when Harry comes back, he finds that the wizarding world has changed a great deal in his absence. He has to deal with new threats and also face the fact that some of his friends have moved on in different ways. He could then work on reuniting with them and rebuilding their relationships while also saving the wizarding world once again.
One idea could be that Harry comes back to Hogwarts as a teacher. He could pass on his knowledge and experiences to the new generation of students. Another plot could involve him returning to solve a new mystery that threatens the wizarding world, something that only he has the skills and knowledge to handle.
One idea could be that Harry comes back through a powerful ancient magic that was dormant. Maybe a hidden spell in the Forbidden Forest is activated by his friends' strong desire to have him back. Another could be that Death itself gives Harry a second chance because he has unfinished business, like fully ridding the wizarding world of the last remnants of Voldemort's dark magic.
One idea could be Harry going back in time to his parents' era at Hogwarts. He could try to prevent certain events that led to their deaths. Another could be him going back to the time of the founders of Hogwarts and getting involved in the creation of the houses and Hogwarts' early rules.
Well, perhaps in the fanfiction, Harry returns to Hogwarts to find a long - lost magical artifact hidden deep within the castle. As he searches, he uncovers secrets about the founders of Hogwarts that were long forgotten. He might also team up with old friends and new students to solve the mystery. It could involve facing off against a new dark wizard who is also after the artifact.
A plot idea could be that the Time - Turner in Harry Potter is actually an ancient magical version of the Flux Capacitor. Hermione discovers this connection while researching in the library. She then tries to build a device that can combine the two technologies. This leads to her accidentally traveling to the Back to the Future universe. There, she meets Marty McFly and they have to work together to fix the time rift that her experiment created.
Well, perhaps in the 'Harry Potter Back to School' fanfiction, there could be a situation where the Marauder's Map starts showing strange new passages and rooms that weren't there before. Harry, Ron, and Hermione decide to explore these during their free time. Also, what if the Sorting Hat gives a very different speech this year, hinting at some big changes coming to Hogwarts? Maybe it could be about a new alliance between the houses. Additionally, a plot could involve a magical creature escaping from the Forbidden Forest and causing chaos in the school corridors as students are coming back to school.
One plot idea could be Harry going back to the time when Voldemort was still at Hogwarts as Tom Riddle. He could try to prevent Riddle from turning into Voldemort by befriending him and showing him a different path. Another idea is that Harry goes back to the time of the founders of Hogwarts. He might learn ancient magic directly from them and use that knowledge to change the future of the wizarding world. Also, he could go back to a time when his parents were alive and get to know them better, which would be a very emotional journey for him.
One idea could be that Naruto discovers a long - forgotten jutsu in an ancient scroll. This jutsu has the power to bring back the dead for a short period. He decides to use it to bring back his parents to seek their advice on how to deal with a new, powerful enemy threatening the Hidden Leaf Village.
One idea could be that Harry goes back in time to prevent certain dark magic spells from being created. He might try to stop Voldemort's rise before it even starts by influencing the earlier events related to the Dark Lord. Another plot could be Harry going back and changing the way he interacted with certain characters like Snape, which could lead to a completely different relationship dynamic. Maybe he could also go back to save some characters who died in the original timeline, like Sirius Black.
One idea could be that Harry Potter, through some magical mishap, ends up in the world of The Walking Dead. He uses his magic to protect a group of survivors from the walkers. Maybe he creates protective charms around their camp or uses the levitation spell to move heavy objects to block the walkers' paths.