Well, they might raise Harry in a world where the Doctor Who universe and the Harry Potter universe collide. They could introduce Harry to all kinds of alien species and magical - technological hybrids. For example, they could show him a broomstick that can also fly through time and space. This would make for a really exciting fanfic as it combines two very popular universes.
It could be Voldemort, of course. He would be a formidable foe, and it would be interesting to see how Amy and Rory's knowledge and skills would help Harry in the fight against him.
Well, it could be about Clara stumbling upon Amy and Rory during one of their adventures. Maybe they're in a timey - wimey situation and Clara's presence changes the course of events. For example, Clara could help them solve a mystery that they were struggling with. She might have some knowledge or a unique perspective that gives them an edge.
The fanfic could center around Harry's life outside of the main events of the books. For example, it could explore his summer holidays in more detail. He could be spending time in the Muggle world and using his magic in creative ways to solve normal, everyday problems. He might use magic to help his neighbor fix a broken fence without the neighbor realizing it was magic. This would add a new dimension to his character and show how he can adapt his magical abilities to different situations.
Well, perhaps the plot could revolve around Harry being cursed in a way that prevents him from eating. His friends would then scramble to find a cure. They might visit different magical creatures or search through ancient spells in the library at Hogwarts. Hermione would be poring over books, Ron would be trying to keep Harry's spirits up with his jokes, all while they face the threat of Harry growing weaker without food.
One possible plot could be that Harry's muteness is a result of a dark curse. He then has to go on a journey to find a cure while still facing the challenges of the wizarding world, like fighting Voldemort. His friends would play a crucial role in helping him communicate and overcome the obstacles. For example, Hermione might develop a special device using magic to help Harry 'speak'.
Perhaps the plot involves a group of enslaved house - elves who decide to fight for their own rights rather than relying on the kindness of wizards. They could form an alliance with some of the human characters who oppose the slave - holding system. This would bring a new perspective to the story, as house - elves are often seen as subservient in the original series. It could also explore the complex relationships between different magical species and how they interact in a world full of inequality.
In this fanfic, as Harry is a cat, he could be seen as an omen or a special sign by some of the wizarding community. There could be a prophecy related to a cat that Harry now fulfills. He might befriend other magical cats in Hogsmeade or Hogwarts and together they uncover a plot by some dark wizards. His cat form could also give him unique abilities like seeing in the dark better or having a heightened sense of smell, which he uses to solve mysteries around the school. For instance, he could detect a strange potion being brewed in the dungeons just by the smell. And his friends would have to protect him from those who might see a cat as just an ordinary animal and not the important Harry Potter.
One possible plot is that Voldemort somehow has a connection to an Asgardian villain. Harry, being the hero, travels to Asgard to find a way to defeat Voldemort once and for all. Along the way, he meets the Asgardian gods. They initially doubt him but soon realize his strength. Harry then combines his wizardry with Asgardian magic to face the dual threats of Voldemort and the Asgardian foe.
One possible plot could be that Harry discovers some corrupt practices within the wizarding legal system. As a lawyer, he decides to take on the powerful figures involved. He uses his knowledge of the Dark Arts and the laws of the wizarding world to build his cases. Along the way, he meets new characters, some of whom are trying to stop him while others are eager to help. His Gryffindor courage drives him forward, and he has to balance his personal life, including his relationship with Ginny, with his fight for justice in the legal realm.
Well, it could be a really wacky plot. Maybe the Jackass crew somehow gets transported into the Harry Potter world. They could be causing chaos in Hogwarts, like trying to do their crazy stunts on the moving staircases and freaking out the students. They might even try to use magic items in their stunts, not really understanding the power and danger of them.