Well, we could expect a lot of culture clash. Grimmjow is from a world of Soul Reapers and Hollows, which is very different from the magical world of Harry Potter. Maybe Grimmjow could end up at Hogwarts and cause chaos among the students and teachers. He might not understand the rules of magic and end up using his own powers in unexpected ways.
One possible plot could be that Grimmjow somehow gets transported to the Harry Potter universe. He might be mistaken for a dark wizard at first. Then, as the story progresses, he could form an alliance with some of the characters. He could teach them about his world's combat styles while learning about magic. There could also be a conflict where an enemy from Grimmjow's world follows him and threatens the safety of Hogwarts.
The plot could involve a conflict between the wizarding world of Harry Potter and the world related to the vizard. Perhaps the vizard world has a different set of rules and ethics regarding magic, and Harry has to navigate through these differences while also dealing with the usual threats in his own world like Voldemort or other dark wizards. It could also lead to new alliances and friendships as he meets characters from the vizard world.
The plot could be really diverse. For example, it could start with the fem Harry Potter accidentally ending up in the Pokemon world. She then discovers that there are some similarities between the two worlds, like the different types of Pokemon could be related to the different elements in the wizarding world. She might try to find a way back home while also getting involved in local Pokemon - related problems. There could be rivalries with other trainers, and she might have to prove herself not just as a wizard but also as a Pokemon trainer. Also, the fanfiction could explore her relationships with the Pokemon she meets, and how they interact with her magic.
Perhaps the plot will revolve around Sakura using her medical ninjutsu skills in a new and different way in the Anbu. She might be part of a special mission to uncover a conspiracy within the ninja village, and her knowledge and skills are crucial for the success of the mission. There could also be a sub - plot about her relationships with other Anbu members, either as friends or rivals.
We might expect to see Loki trying to fit in with the Avengers. He could start off as a reluctant member, perhaps forced to join due to some external threat. There could be a lot of tension as the other Avengers don't trust him at first. Then, as the story progresses, he might gradually earn their trust through his actions, like using his magic to save the day or providing crucial information about an enemy.
Well, we might expect a story where Naruko has to deal with the typical vampire struggles like controlling her thirst for blood. There could also be a plotline about her trying to hide her true nature from her friends or family. Maybe she falls in love with someone who is initially afraid of her vampire side.
Perhaps it will focus on Kuroko's extraordinary intelligence being applied to solve various problems. Maybe he uses his genius to outwit opponents in a game or come up with unique strategies.
In 'harry potter is lord potter fanfiction', we can anticipate a whole new world of possibilities. Since Harry is now Lord Potter, there could be a shift in the power dynamics. His family history might be explored in more depth, perhaps revealing secrets that were previously unknown. There could be new magical artifacts or spells associated with his new status. The fanfiction could also introduce new characters who are drawn to or affected by this new 'Lord Potter'. It might even change the overall tone of the story, from a more boy - hero's journey in the original to a more complex, political, or power - centric narrative as he takes on this new identity.
In a Harry Potter is a Slayer fanfiction, one can anticipate a reimagining of the relationships. For example, the friendship between Harry, Ron and Hermione could be tested in a world full of slayer - like challenges. The fanfiction could also introduce new magical items or weapons that are a mix of the two worlds. Moreover, the moral and ethical dilemmas in Harry Potter could be further complicated by the addition of the slayer elements, making for a very engaging and complex story.
In a 'Harry Potter is Xanxus' fanfiction, we could expect a blend of the two worlds' magic. Maybe Harry would use some of Xanxus' fighting styles or leadership techniques within the Hogwarts environment. Also, the relationships in the story would be different. His friends might react differently to this new Harry. For instance, Hermione might try to understand this new side of Harry while Ron could be a bit more wary. It would be a whole new take on the Harry Potter story.
We can expect a deeper exploration of Harry's character. His intelligence could lead to new relationships or rivalries. He might form alliances with other smart students or be pitted against those who envy his smarts. Also, the fanfiction could show how his intelligence affects his decisions regarding the fight against Voldemort, like devising more strategic plans to defeat him.