In the 'harry is a ghost child fanfic', a really interesting plotline could be Harry's journey to find peace. As a ghost child, he is stuck between two worlds. He might start a quest to figure out how to move on or if there is something he needs to do in the living or spirit world to find his true rest. Maybe he has to right some wrongs he did while alive or help someone in the living world to finally be at peace.
Perhaps Harry, as a ghost child, tries to communicate with the living world. He could be trying to protect his loved ones from danger that they can't see. For example, he might warn them of a hidden curse or an approaching dark wizard. And he may use his unique ghostly abilities to do so.
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.
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.
One possible plotline could be the journey of the 'child of dark prophecy' to discover their true power. Maybe they start off in a small, unassuming village and as they grow, strange things start to happen around them. They could encounter various allies and enemies along the way, each with their own motives regarding the prophecy.
One possible interesting plotline could be the growth of the abandoned child. Maybe they discover some unique powers within themselves as they struggle to survive in the Naruto world. For example, they might have a special connection to a long - forgotten jutsu.
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 interesting plotline could be Harry's adventures in the afterlife realm where he has to deal with different types of souls. Maybe he meets some souls with unfinished business and tries to help them move on.
Well, one possible interesting plotline could be Harry teaming up with the Autobots to fight a common enemy. Maybe there's a powerful Decepticon that threatens both the wizarding world and the Autobots' home planet, and Harry's magic combined with the Autobots' technology is the key to victory.