In terms of his romantic relationships, if he had any budding feelings for Ginny, for example, she might be initially attracted to his new, more mysterious side but then grow concerned as she sees the darker aspects of his Morgana - reincarnation start to surface. His relationship with the Hogwarts professors would be in flux. Some, like McGonagall, might try to give him the benefit of the doubt while still keeping a close eye on him. And his relationship with the other students would be a mixed bag. Some would idolize him for his new - found power and connection, while others would be afraid and keep their distance.
His relationship with Hermione might become more strained. Hermione, being very rule - bound and having a strong sense of right and wrong, might be very wary of Harry's new connection to Morgana. Ron, on the other hand, might be more accepting at first, but then start to worry as Harry shows signs of changing. With Dumbledore, there could be a whole new level of secrecy and trust issues, as Dumbledore tries to guide Harry while also being cautious of his Morgana - influenced powers.
His friends might be initially shocked. Hermione would be super curious and want to research all about it. Ron might be a bit jealous at first, but then come around. Their adventures would be different as Harry would have new insights from the founders.
Harry's relationship with Snape would be complex. Snape, who already had a difficult relationship with Harry, might be even more hostile. He could see Harry's connection to the Grim Reaper as a sign of dark magic. But as the story progresses, Snape might come to realize that Harry is using his powers for good. And Harry, on the other hand, might start to understand Snape better, seeing that they both have a connection to a power that is often misunderstood. With the other students, some might be afraid of Harry and avoid him, while others might be drawn to his new - found power and mystery.
If Harry Potter was trained by Morgana in fanfiction, his story would take a very different turn. Morgana's influence would bring a new level of complexity to Harry's character. He might start to question the very nature of good and evil, as Morgana's magic often blurs those lines. His relationships with his friends like Ron and Hermione would be put to the test. They might not understand his new path and he might feel isolated from them. His new skills and knowledge from Morgana could also attract the wrong kind of attention from dark wizards who want to use him for their own purposes. His story would be a tale of self - discovery in a much darker and more complex magical world.
His relationship with the teachers would also be different. Snape, for instance, might be more conflicted about Harry. On one hand, he's in Slytherin which Snape favors, but on the other hand, he's still Harry Potter. And Dumbledore would have to watch Harry from a different perspective, perhaps guiding him in a more subtle way to make sure he doesn't get too influenced by the darker aspects of Slytherin house.
His relationship with his enemies like Voldemort would also be affected. If Regina has some sort of power or influence over Harry, Voldemort might see him as an even greater threat or an easier target. Harry might also have different ways of defending himself, influenced by Regina's methods or the new environment he's in. For example, Regina might have her own way of dealing with dark magic that she teaches Harry, which changes how he approaches Voldemort and his Death Eaters.
His relationship with Hermione and Ron would likely become strained at first. Since he's at a different school, they wouldn't be able to see each other as often. Hermione might be a bit jealous that Harry is experiencing a different magical education. With new friends at Beauxbatons, Harry could form a close bond with a French student who has a very different view on magic. This new friend could introduce Harry to new spells and ways of thinking that he hadn't considered before.
His relationship with Ron would be very different. Ron might be initially distrustful or even hostile towards Harry in Slytherin. But as the story progresses, they could come to understand each other better. Harry's relationship with Hermione could also change. She might be more cautious around him at first, but then realize that Harry is still the same person deep down. And his relationship with Draco would be much more complex. They could start as rivals, but then become allies in some situations, as they both have a connection to Slytherin.
Her relationship with Ron and Hermione would be different. Ron might be more easily charmed by her siren side at first, which could cause some tension. Hermione would be both curious and a bit worried about her new abilities. She might try to research sirens more to help Harry control her powers.
The plot would change a great deal. For one, Harry would be much more powerful physically. So when facing Voldemort, he could use Thor's strength in combat, not just rely on magic. He might be able to take on Death Eaters more easily.
At Durmstrang, Harry's relationships would be a whole new ball game. He might encounter students from different magical families, some of whom have a long - standing rivalry with the British wizarding families. This could make it hard for him to trust people initially. However, he could also find a small group of like - minded individuals who are against the Dark Arts being misused. These new friendships could give him a different perspective on the wizarding world and help him grow as a wizard and a person.