Perhaps Harry became 500 years old due to a time - travel accident or a curse gone wrong. In this fanfiction, he could be a mentor to the new generation of wizards, sharing stories of the past and teaching them spells and magic that have been long forgotten. He might also be on a quest to find a way to reverse his age or at least understand the true nature of what happened to him.
Well, he could have made a deal with a powerful magical being to gain immortality, but it came with the price of living for 500 years. As a 500 - year - old Harry, he might be involved in a complex web of political intrigue in the wizarding world. The old families might see him as a threat or a valuable ally, and he has to navigate through all these power plays while also dealing with his own internal struggles of having outlived all his friends and family from his original time.
One possibility could be that Harry has been alive for 500 years by using some powerful magic that had unforeseen consequences. He might have seen the rise and fall of many magical civilizations and now has a vast knowledge of magic that no one else does. He could be a sort of hermit, living in an isolated place and only emerging when there is a great threat to the wizarding world that only his ancient knowledge can solve.
One possible plot could be that Harry, being 1000 years old, has lost his memory over time. The story could revolve around him trying to regain his memories and in the process, he uncovers long - forgotten magic and dark secrets of the wizarding world. He might meet descendants of his old friends who help him on this journey of rediscovery.
The plot could revolve around Harry being 2000 years old and having to adapt to the modern wizarding world. He has seen so many changes in magic and society. He might struggle with modern technology in the wizarding world while also trying to pass on his ancient knowledge to the new generation. There could be a conflict where some people want to use his knowledge for wrong purposes and he has to protect it.
One possible plot could be that Harry, having faced so many near - death experiences throughout his life, has developed a unique perspective on death. He might see it as a release from the burdens he has carried, like the weight of being the Chosen One. In this fanfiction, perhaps he has a series of dreams or visions where he converses with Death as if it were an old acquaintance, discussing the meaning of life, his past losses, and the fates of those he loves.
Well, it could be about their continued adventures in the wizarding world. Maybe they are working together on some new spells or dealing with a new dark force that has emerged. They might also be mentoring the new generation of wizards at Hogwarts.
One possible plot could be that Harry's insanity is caused by a cursed object. His friends then have to find a way to break the curse while also dealing with his erratic behavior. For example, Harry might accidentally reveal secrets to the wrong people because of his insanity.
The plot could involve Harry struggling to hide his true nature as a Nathrezim from his friends at Hogwarts. He might have new, dark powers that he has to learn to control, and he's afraid of how others will react if they find out. Meanwhile, Voldemort senses something different about Harry and is both intrigued and threatened by him.
In this fanfiction, Harry's Animagus skills as an Avenger might also lead to some interesting character interactions. He could teach the other Avengers about magic and how his Animagus form works. For instance, Tony Stark might be intrigued by the magic behind it and try to find a scientific explanation or a way to replicate it. Meanwhile, Steve Rogers could be more interested in how Harry uses this ability in combat situations.
Well, one possibility is that Harry, now reborn as an Uchiha, might discover his newfound Sharingan abilities early on. He could use his knowledge from his past life to quickly rise through the ranks in the Uchiha clan. Maybe he'd try to prevent the tragedies that befell the Uchiha in the original Naruto story, like the massacre. He could also use his magic - if it somehow transferred with him - in combination with his ninja skills to become a truly formidable force.
One possible plot could be that the contract is a magical binding that forces Harry to work with Voldemort in some way. Maybe it's a deal to save the lives of his friends. So, Harry has to reluctantly follow Voldemort's orders while secretly looking for a way to break the contract.
One possibility could be that Harry is in a difficult situation, perhaps a mystery in a new world that he's not familiar with. He calls Gibbs because he has heard of Gibbs' skills in solving problems and investigations. Gibbs then uses his no - nonsense approach to start looking into the matter, guiding Harry through the steps of finding clues and making sense of the chaos around him.