Well, if Harry were raised by Voldemort in fanfiction, it could lead to a really complex character development. Harry would likely grow up with a great deal of internal conflict. He might be feared by the wizarding world as he is associated with Voldemort. However, he could also potentially use the knowledge he gains from Voldemort to defeat him in a different way. He could have a unique understanding of Voldemort's weaknesses.
In such a fanfiction, Harry might become a very different person. He could be more in tune with the Dark Arts. Maybe he would have a skewed sense of morality, influenced by Voldemort's views. He might also be more powerful in the Dark Arts but struggle with his identity as he is constantly in conflict between what he's been taught by Voldemort and his own inner goodness.
If Hermione was raised by Voldemort in fanfiction, she might have a completely different personality. She could be more ruthless and power - hungry. Her magic might be used for more dark purposes. For example, she could be trained to be one of Voldemort's most powerful lieutenants, using her intelligence to plan his attacks and strategies.
In such a fanfiction, Harry might grow up with a very different set of values. Slenderman is often depicted as a creepy and somewhat malevolent figure. So Harry could be isolated from normal society. He might be trained in skills that are not typical for a regular upbringing, like how to move stealthily or sense danger in an uncanny way.
Well, if Harry were raised by the Joker in fanfiction, his personality would likely be a complete contrast to what we know of him. The Joker's influence would make him unpredictable. He might not value life in the same way as in the original Harry stories. Instead, he could be more interested in creating chaos and playing cruel jokes on people, much like the Joker does. It would also change his relationships, as his friends in the original story would probably be very wary of him or even become his enemies due to his new, Joker - influenced behavior.
Well, it could be really strange. Harry might find some new perspectives on his enemies or himself. And Voldemort could get angry as he might not like how he is portrayed in some fanfictions. Maybe he'd try to change things according to what he reads.
If Harry Potter was adopted by Voldemort in fanfiction, it would be a very strange and complex situation. Voldemort is a very evil character, but he might see Harry as a tool or an heir. Harry could be exposed to the darkest magic and the inner workings of the Death Eaters. However, Harry's own strong will and the influence of his parents' sacrifice might still shine through, leading to a possible rebellion against Voldemort later on.
If Voldemort gets custody of Harry in fanfiction, it would be a huge deviation from the original story. Harry would probably be exposed to a lot of dark and cruel things. Voldemort could try to break Harry's spirit and make him abandon his values. There might be a struggle within Harry between the good he has been taught and the evil that Voldemort represents. And the wizarding world would be in even more chaos as Voldemort would have more control over the one person who was seen as the hope to defeat him.
If Harry Potter were raised by a gang in fanfiction, his values would likely be very different. He could be more cynical. Instead of the traditional Hogwarts values, he might value loyalty within the gang more. He'd also be more used to a rough - and - tumble lifestyle, which could make him a formidable wizard in combat as he'd be less afraid to get his hands dirty.
In this kind of fanfiction, Harry Potter's character might develop some unique qualities. Maybe he would learn Whis's calm and collected way of handling things. For example, he could be more patient in the face of danger, like when facing Voldemort. Whis is known for his wisdom, so Harry might also gain deeper insights into magic and the wizarding world, which could potentially change the course of his battles against the dark forces.
In such a fanfiction, Harry Potter might grow up with a completely different set of values. He could be trained in courtly manners, have access to vast resources, and perhaps be more politically astute. His relationship with the wizarding world might also be different, as he would approach it from a royal upbringing perspective.
Well, in such a fanfiction, Harry might grow up with a deep love and understanding of magical creatures, just like Newt. He could be more in tune with the natural magic in the world outside of Hogwarts' regular curriculum. For example, he might be able to communicate with magical beasts more easily than in the original story.