Zelretch is likely a very powerful and perhaps mysterious character in this fanfiction. He could be an ancient wizard or a being from a different magical dimension with knowledge far beyond what is known in the normal Harry Potter universe.
Well, it could be about Zelretch somehow getting involved in the Harry Potter universe. Maybe he uses his powers to change the course of events in Hogwarts, or he could be a hidden figure guiding Harry in a different way than Dumbledore.
One possibility in the 'naruto meets zelretch fanfiction' is that they team up to face a common enemy. Zelretch with his powerful magic and Naruto with his ninja abilities could create a very interesting and powerful duo. They might also learn from each other, with Naruto teaching Zelretch about the values of the ninja world like loyalty and perseverance, and Zelretch showing Naruto the vastness of the magical world.
The main characters are clearly Shirou and Zelretch. Shirou is often known for his heroic ideals and his journey in the world of magic and heroism. Zelretch, on the other hand, is a very powerful and mysterious mage.
In the 'shirou meets zelretch fanfiction', Shirou might learn some unique magic from Zelretch. Since Zelretch is a powerful mage, he could have a great influence on Shirou's growth as a mage.
One common theme could be identity. Since they are gender - switched, they have to re - evaluate who they are and how they interact with the world. Another theme might be friendship or partnership. They often team up in these fanfictions to achieve a common goal. For example, they could be on a quest to save a magical world.
In the 'naruto meets zelretch fanfiction', neither might be truly dominant. They could be equals. Naruto has shown great growth and the ability to overcome powerful foes. Zelretch has his vast magical knowledge and power. They might end up respecting each other's strengths and working together without one being over the other. For example, they could combine their powers in unique ways, like Naruto using his shadow clone jutsu in tandem with Zelretch's magic to create a more powerful attack.
If Harry Potter was raised by Zelretch in fanfiction, his personality would likely be shaped in a very distinct way. Zelretch's influence might make Harry more aloof or more inquisitive about the deeper aspects of the magical world. His relationships with other characters like Ron and Hermione would also be different. He might not be as close to them since his experiences and knowledge base would be so different. He could also face different kinds of challenges, perhaps ones that are more related to the greater magical universe rather than just the problems within Hogwarts.
Well, perhaps Harry Potter could learn some unique magic skills from Zelretch. Maybe Zelretch teaches Harry how to manipulate time in a way different from normal wizarding magic. It could also involve Harry being trained in some super - advanced combat magic that gives him an edge against Voldemort and his Death Eaters.
A plotline could involve Zelretch having a specific reason for turning Shirou female. It could be part of a grand plan to save the world or to correct some imbalance in the magical realm. And as Shirou is now female, she may discover new magical abilities or limitations that come with her new form. This could lead to a whole new adventure as she tries to master these changes while dealing with the overarching plot.