Perhaps a plotline where Harry discovers other immortal beings. He could form a sort of community with them, learning about different cultures and powers that immortality has bestowed upon them. They might teach him how to better control his immortality, like hiding his true nature from mortals or using his extended lifespan to gain knowledge that no one else has. This could lead to adventures as they try to protect their secret from those who would seek to exploit it.
Perhaps they would face challenges from dark wizards who envy their immortality. They would have to use their combined skills and the wisdom gained over time to defeat these foes. For example, they could encounter a powerful dark wizard who tries to steal their immortality for himself. Percy, with his skills in water magic, and Harry, with his experience in facing Voldemort, would team up in a unique way to combat this threat.
One possible plotline could be the discovery of the secret child and how it affects Harry's relationships with his friends and family. For example, Hermione and Ron might be shocked at first but then become supportive. Another could be the challenges the child faces growing up in the wizarding world with this secret hanging over them.
In some Harry and Ginny Cursed Child fanfictions, the plot could revolve around their children. Ginny might notice some strange behavior in their kids that she suspects is related to the Cursed Child's influence. She then teams up with Harry to investigate. They could find out that there are some latent magical powers in their children that are being affected by the dark magic from the Cursed Child's events. This could lead to a series of challenges and adventures as they try to help their children and safeguard the wizarding world.
In some 'Harry and Draco secret child fanfiction', there could be a plotline where the child serves as a bridge between the two families. Harry's side, like the Weasleys, and Draco's family might initially be against the idea of the child. But as the story progresses, the child's presence changes their perspectives. The child might also struggle with its own identity, being part wizard from two very different backgrounds, and this internal struggle could be a central part of the story.
Well, perhaps the child in the 'Harry Potter child in Azkaban' fanfiction forms unexpected alliances. Maybe they team up with some of the inmates who have their own reasons to oppose the unjust system of Azkaban. This could lead to a series of adventures where they try to break free from Azkaban's clutches together.
One possible interesting plotline could be the Rose Child having unique magical abilities that are different from the regular magic in the Harry Potter world. For example, they might be able to communicate with a special kind of magical creature that others can't.
One possible plotline could be Harry exploring the afterlife as a ghost child and meeting other spirits. He might discover secrets about his past life that were hidden when he was alive.
One interesting plotline could be Harry fully exploring and mastering the powers that come with being the Master of Death. He might use these newfound abilities to reshape the wizarding world, like eliminating dark magic at its roots.
Well, a popular Harry Potter immortal child fanfiction could be 'Immortal in the Wizarding Realm'. In this story, the immortal child might face challenges like outliving friends and seeing the passage of time differently. Another great one could be 'The Child Beyond Time' where the child's immortality gives them a different perspective on the events in the wizarding world. And then there's 'The Immortal Potter Kin' which might add a new twist to the Potter family story with the addition of an immortal child.
Well, in some 'naruto child of prophecy fanfiction', a great plotline is the child's journey to uncover the true meaning of the prophecy. It might involve them traveling to hidden places in the Naruto world, like ancient temples or forgotten caves, where they find clues about their destiny. Also, the way they interact with the Akatsuki members can be really engaging. Maybe they try to redeem some of the members or have intense battles with them.