One possible plotline could be Harry struggling with his new - found identity and the powers that come with being Satan's son. He might be shunned by his friends in the wizarding world who see him as a threat.
Maybe there could be a plot where Harry is torn between his loyalty to the wizarding world and his new, darker heritage. He could be courted by dark forces who want to use him for their own evil purposes, while he tries to resist and find a way to use his powers for good.
One possible plotline could be that Harry is raised in the Malfoy Manor. This would give him a very different upbringing compared to his life with the Dursleys. He might be taught different values and magic from a young age.
One possible plotline could be that Harry discovers his true parentage as Loki's son and has to deal with the shock and confusion. He might then start to explore his new - found heritage, learning about Norse magic and mythology. Another plotline could involve the wizarding world's reaction to this revelation. They might be suspicious or even afraid of Harry's new connection.
One possible plotline could be that Harry has to hide this fact from his friends at Hogwarts, fearing their reaction. He might struggle with feelings of guilt and confusion, especially if he starts to show some of Voldemort's darker tendencies.
Yes, there might be such a fanfiction in the vast world of fan - created works. However, this is a very non - canonical and often extreme interpretation. The 'Harry Potter' series by J.K. Rowling has its own well - established lore and character relationships, and this fanfiction idea goes against the original spirit in a major way.
One possible plotline could be Harry struggling to come to terms with his new identity as the Son of Lucifer. He might face internal conflict, wondering if he's doomed to be evil like his supposed father. Another could be the wizarding world's reaction to his revelation. Some might fear him, while others might try to use his power for their own gain.
Another plotline could be that the wizarding world discovers Harry's connection to Arwen and Middle - earth. This causes a stir as they try to understand what it means for their world. Some might fear the unknown powers he could possess, while others see it as an opportunity to expand their magical knowledge. Harry could be caught in the middle of this, trying to prove that his connection to Arwen is a positive thing and that he can use it to protect both his worlds from common threats like dark forces that could exist in both the wizarding world and Middle - earth.
One possible plotline could be the revelation of the truth about Harry's parentage and how it affects his relationships with other characters. For example, his relationship with Dumbledore might change as he now has a different family connection through Severus. Another could be how Severus deals with having a son all of a sudden and the challenges he faces in protecting Harry in a different way than he did before.
One possible plotline could be Naruto getting transported to a world where Satan exists and Devil Slayers operate. He might have to learn their ways to survive and end up using his ninja skills in new and unexpected ways. Another could be that a Devil Slayer ends up in the Naruto world and has to deal with the different chakra system while also facing off against Naruto - like enemies. And perhaps Satan has some connection to an ancient evil in the Naruto universe that they all have to fight together.
One possible plotline could be that Harry discovers the truth slowly. At first, he might notice strange similarities between himself and Bellatrix or some unexplained magical abilities that seem to link him to her. This discovery could throw him into an identity crisis as he has always thought of himself as an orphan with no real family other than the Dursleys.
Well, a plotline could involve Harry finding out about his true parentage through some hidden clues or a magical revelation. This could lead to a major identity crisis for him as he has to reconcile his new - found connection to Snape with his existing relationships. Also, the wizarding community's reaction to this revelation would be an interesting aspect. Some might be outraged, while others might see it as a chance for a new beginning between the two families.