Well, if Harry Potter becomes a Power Ranger fan, the story could change in many ways. Maybe he starts to incorporate some of the Power Ranger's fighting styles into his duels at Hogwarts. He might even dream of having Ranger powers to fight Voldemort.
If Harry Potter becomes a Pokemon fanfic, the whole dynamic of the story would shift. Instead of focusing on Voldemort and the dark arts, Harry would be more concerned with becoming a great Pokemon trainer. He would travel to different regions in the Pokemon world, like Kanto or Johto, instead of Hogwarts and its surrounding areas. His friends, like Ron and Hermione, might also get involved in the Pokemon adventure. Hermione would be reading books about Pokemon, trying to understand their biology and behavior, while Ron would be excited about the food in the Pokemon world. And the Hogwarts professors would be left wondering what has happened to their star pupil.
If Naruto becomes the leader of Akatsuki, it would completely flip the Naruto universe on its head. First, Naruto's ideology of peace and friendship would clash with Akatsuki's original goals of collecting tailed beasts. He might try to reform Akatsuki from within, turning it into a group that actually protects the villages instead of causing chaos. This could lead to some very interesting alliances. For example, he might be able to convince some of the Akatsuki members who have their own tragic backstories, like Sasori or Deidara, to join his new cause. Also, the other villages' reactions would be mixed. Some might be extremely suspicious at first, while others could see it as an opportunity for a new kind of peace in the shinobi world.
The plot could be that fem Harry Potter is a secret Power Ranger fan in the wizarding world. One day, a strange magical event causes a rift between the two worlds and some Power Rangers end up in Hogwarts. Fem Harry Potter then reveals her knowledge and love for the Power Rangers. She helps them navigate the wizarding world while also learning from them how to be a Power Ranger. Eventually, they find out that there is an evil force that wants to destroy both the wizarding world and the world of the Power Rangers. So, they train together, combining magic and Ranger powers, and go on a quest to defeat this evil force.
His relationships would be in shambles. Hermione and Ron would be horrified and try to stop him. They might not even believe it at first, thinking it's some sort of dark magic trick. But as Harry delved deeper into the Sith ways, they'd realize it's real.
His sense of responsibility would likely increase even more. Harry has always been responsible, but as a priest, he would feel accountable for the spiritual well - being of others. He would become more solemn and less impulsive perhaps. His Gryffindor impulsiveness might be toned down as he takes on a more serious religious role.
Well, if Hermione and Blaise were siblings, Hermione might have had access to different knowledge and resources. Blaise comes from a different social circle in the wizarding world. This could have influenced Hermione's studies. Maybe she would have been exposed to some Slytherin - favored magic earlier. In terms of the overall plot, the conflict between the houses might have been less intense. Since Hermione has friends in Gryffindor and a brother in Slytherin, she could have played a greater role in promoting unity among the students. And Blaise himself might have changed. With Hermione as his sister, he might not be as cold towards the Gryffindors as he was in the original story.
He'd probably start comparing the magic in his world to the powers of the Power Rangers. Maybe he'd think about how the Power Rangers' powers are more showy and physical, while magic in Hogwarts is more subtle and complex.
In this kind of fan fiction scenario, the relationship between Snape and Lily could have been explored in a whole new light. Maybe Snape would have been more open about his feelings earlier, and this could have led to a different sequence of events. Harry would also likely have a different personality, influenced by having Snape as a father figure. He might be more brooding or more academically driven from the start.
Well, if Snape became Harry's father in fan fiction, the whole dynamic of the story would shift drastically. Harry might grow up with a different set of values, as Snape was a complex character with his own moral code. He could be more proficient in potions from an early age. Also, Snape's relationship with the Order of the Phoenix and Dumbledore would have a more personal touch in relation to Harry.
If Hermione becomes a Slytherin in fanfiction, it would completely turn the original story on its head. For one, the dynamic between her and the other characters would be drastically different. She might form alliances with Slytherins like Draco Malfoy, which would be unthinkable in the original plot. This could lead to new adventures and conflicts, as her Gryffindor friends might not trust her as much.