Well, one possibility is that Harry would grow up with a very different set of values. The Malfoys are known for their pure - blood supremacist views. Harry might initially be influenced by this but then could have an internal struggle as he discovers his own true nature and the importance of equality. He could also learn different types of magic from the Malfoy family's traditions, which might make him a more complex and different wizard compared to the one we know from the original series.
Well, one possibility is that Harry would grow up with a very different set of values. The Malfoys are known for their pure - blood supremacist views. But perhaps, deep down, Harry could influence them to be a bit more accepting. He might learn dark magic quicker than in the original story, but also struggle with his own sense of right and wrong as the Malfoy values clash with what he feels inside.
One interesting plotline could be how Harry adjusts to the Malfoy family's pure - blood traditions while still holding onto his own values. For example, he might struggle with the Malfoys' views on Muggle - borns. Another could be his relationship with Draco Malfoy. Instead of being rivals, they could become brothers in a sense, and their dynamic would change completely, leading to new adventures at Hogwarts together.
Harry's character might develop a more refined sense of magic. With the Malfoys' influence, he could become more aware of the subtleties of pure - blood magic. His self - confidence could also change. Instead of relying on his Gryffindor bravado, he might learn to be more calculating like the Slytherins. For example, in dealing with school bullies, he might use his wits rather than just charging in.
In the 'Harry adopted by the Malfoys' fanfiction, one possibility is that Harry would receive a very different kind of magical education. The Malfoys might try to mold him into a Slytherin - like wizard, but Harry's own Gryffindor - like courage would constantly be at odds with that. Also, his relationship with Draco could be very complex, ranging from initial rivalry as they are brought up in the same household to a possible understanding and even friendship later on.
Well, in such a fanfiction, Harry might be given a very different education. The Malfoys could try to indoctrinate him with pure - blood supremacist ideas at first. But as he grows, he might rebel against it. He could also be exposed to a different social circle within the wizarding world. Maybe he would have more interactions with other Slytherin families and this would change how he views things like House rivalries. And his relationship with Dumbledore would be very strained as the Malfoys are not on good terms with Dumbledore.
If adopted by the Malfoys, Harry's personality would be a complex mix. He would be exposed to the Malfoy's elitist views from a young age. This could make him initially seem cold and distant. However, his innate goodness would still be there. He might struggle to reconcile his true self with the Malfoy persona he's expected to have. For example, he might be polite and proper in public as a Malfoy, but secretly help those who are oppressed by the pure - blood ideology, showing that his original kind - hearted personality is still fighting to surface.
In Harry Potter fanfiction, the Malfoys are often portrayed in a more complex and sometimes positive light. Some fanfictions might explore Draco Malfoy's struggle between his family's beliefs and his own emerging sense of right and wrong. He could be shown as having a change of heart, perhaps influenced by his interactions with Harry and his friends. This gives a new dimension to his character that we don't fully see in the original books.
Well, one possibility is that Harry, being 'evil' in this fic, might use the Malfoy family's wealth and influence to his advantage. He could learn dark magic from the Malfoys or their associates. Maybe he would turn against his old friends from Hogwarts and side with the Slytherin crowd more. He could also be involved in power struggles within the wizarding world, with the Malfoys backing him up.
Obviously, Harry Potter is the central character. Then there are the Malfoys - Lucius, Narcissa, and Draco. Hermione and Ron might also be involved, perhaps as characters who are initially suspicious of Harry's new situation but later come to understand it.