His character could develop in terms of his loyalty. Initially, his loyalty is only to his family and the Slytherin house. However, as the year unfolds, he might find himself torn between different loyalties. He could start to develop a sense of loyalty towards Hogwarts as a whole. This could be due to some shared experiences with students from other houses during difficult times. Also, his self - confidence might take a different turn. Instead of relying on his family name for confidence, he could start to build his self - worth based on his own actions and achievements at Hogwarts.
The main plot points could include Draco's struggle with the new environment at Hogwarts. He's used to a certain lifestyle and suddenly he has to deal with rules and a diverse group of students. Also, his interactions with the Slytherin house. There could be some internal power struggles within the house that Draco gets involved in. And of course, his encounters with Harry Potter and his friends. These meetings might not always be confrontational but could also lead to some unexpected alliances or at least a better understanding of each other.
One possible fanfic could be about Harry using a time - turning device during his first year to go back and prevent Draco Malfoy from making some of his early bad decisions. Maybe Harry witnesses young Draco's insecurities that lead to his later mean - spirited behavior and tries to change things for the better in their relationship.
His character might develop in a more self - interested way. Growing up with the Malfoys, he may not have the same selfless hero complex as in the original. He could be more focused on protecting his family (the Malfoys) and their status in the wizarding world.
He might be more reserved. The Malfoy upbringing would likely make him less impulsive compared to his canon self. He could also be more calculating in his actions.
Harry would likely be more confident in his pure - blood status, at least on the surface. Since he's raised by the Malfoys' twins, he'd be exposed to the pure - blood elitist culture from a young age. He might be more calculating and less impulsive than in the original story, having learned from the Malfoy family's shrewd ways.
Perhaps Harry travels back in time and tries to befriend Draco before he becomes so antagonistic. He could show Draco the error of his ways early on, like how being mean to others isn't cool. This could lead to Draco being a more positive influence in Slytherin house instead of causing trouble.
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.
He might be more arrogant. Growing up with the Malfoys, he'd be used to thinking his family was superior. He'd lack the humility Harry in the original series has.
He'd be more likely to be initially haughty. Since the Malfoys are known for their pride in their pure - blood status. But he might also grow to be more cunning as he'd be in an environment where manipulation is sometimes used.
His personality could become more reserved. Growing up in the Malfoy household, he might be taught to keep his emotions in check and not show too much vulnerability. But at the same time, his underlying sense of right and wrong would still be there, causing internal conflict.