In this type of fanfiction, there could be a plot where Harry is hypnotized during a Quidditch match. The opposing team might have used some dark magic to hypnotize him so that he would lose the match. However, his broomstick, which has a special bond with him, could start to resist the hypnosis on its own. Meanwhile, his teammates realize something is wrong and try to protect him from further harm while also looking for a way to break the spell.
A really cool plot could be Harry getting the power of mind - reading. This would give him a huge advantage in his fight against Voldemort. He could read the minds of the Death Eaters to find out their plans and secrets. However, this power also has its drawbacks. He might accidentally read the minds of his friends and learn things they don't want him to know, which could strain his relationships. Also, it could be overwhelming for him to constantly hear the thoughts of everyone around him in a crowded place like Hogwarts.
Another possible plot is that Harry, realizing the importance of fitness in his fight against Voldemort, decides to train his body as well as his magic. He might go on adventures in the Forbidden Forest, running from dangerous creatures and climbing trees, which not only improves his fitness but also his survival skills.
Maybe Harry uses a forbidden spell in the Gryffindor common room and gets caught. As a result, he's grounded and not allowed to participate in the upcoming wizarding event. He then has to find a way to make it up to his housemates.
It could be Voldemort. He might use hypnosis as a new way to get to Harry, trying to make him a weapon against the Order of the Phoenix. Another possibility is a new dark wizard who wants to make a name for himself by controlling Harry Potter.
Well, in the fanfic, Harry as a girl might have a different experience with the sorting hat. Instead of being sorted into Gryffindor easily like before, the sorting hat could consider her new personality traits due to the gender change. She might even end up in a different house, which would completely change her Hogwarts experience. And her interactions with the other houses' students would be very different too.
In some Harry Potter 8 fanfictions, there are plots where the characters continue to face new dark magic threats. For example, a new dark wizard might emerge, and Harry, Hermione and Ron have to use their combined skills and knowledge to defeat this new foe. Another plot could be about the exploration of the wizarding world's past in more depth, revealing secrets that were previously unknown.
Most of the official 'Harry Potter' works don't have such themes. Fanfictions with this kind of rather strange combination might be a very niche area. Maybe some independent authors are exploring such concepts in their own creative ways. But it could also be that very few exist due to the odd nature of the combination.
One interesting plot could be that Misty is hypnotized by a mysterious Pokémon trainer who wants to use her knowledge of water Pokémon for his own gain. He hypnotizes her into leading him to rare water Pokémon habitats. Another plot might involve Misty being hypnotized to forget her friends and her love for Pokémon training, and her friends have to find a way to break the hypnosis. Maybe a new villain uses a special device to hypnotize Misty and make her battle against her will in Pokémon battles.
One possible plot could be that Spider - Man accidentally hypnotizes a villain into becoming his ally for a short time. This could lead to some comical situations as the villain tries to adapt to their new 'good' self.
Another plot could involve Harry being seild away accidentally during a magical experiment gone wrong. He could end up in a different time period, like the past of the wizarding world. There, he might interact with the founders of Hogwarts, which would be really interesting as he could learn about the origins of the school and the magic they used. He would also have to find a way to get back to his own time.