His brother might become overconfident. Since he's now the center of attention instead of Harry, he could get a big head. He might think he's invincible and not take the necessary precautions in the wizarding world. He could also feel a lot of pressure, as everyone would be expecting him to be the hero. This could lead to him either rising to the occasion or crumbling under the weight.
Well, it would completely disrupt the original dynamic. Harry's relationship with his friends and the wizarding world was centered around his own journey. If he was abandoned for his brother, his brother might become the 'chosen one' figure in this new scenario. This would mean that Harry might grow up feeling resentful or neglected, and his magical abilities could develop in a very different way, perhaps in secret. It could also lead to a different set of alliances and enmities within the wizarding world.
One possible scenario could be that Harry grows up on the streets, learning to fend for himself and developing a tough exterior. He might encounter some kind of mentor figure who helps him discover his magical abilities in a very different way than in the original story.
One possible plotline could be that Harry discovers he has a half - brother he never knew about. Maybe his father had a relationship before he met Harry's mother, and this new character enters Harry's life. They initially have some conflicts due to jealousy or differences in upbringing, but over time, they come to love and support each other.
He might turn to his studies more intensively. Since he has no friends to distract him, he could pour all his energy into learning new spells and magic, becoming more powerful in the process.
Snape could also be a central figure. Maybe he discovers Harry's situation early on and has a change of heart. He could secretly guide Harry, teaching him things about magic and the wizarding world that he otherwise wouldn't know, all while still maintaining his aloof exterior.
He might be more distrustful. The feeling of being abandoned could make it hard for him to trust others easily. For example, when he first meets Dumbledore or his new friends at Hogwarts, he may be hesitant to open up completely because he's been let down by the most important people in his life - his parents.
It's hard to say for certain. The Harry Potter fanfiction community is vast and diverse. Some writers like to create alternative universes where characters have completely different relationships. But given the nature of Harry and Lucius in the original series - one being the hero and the other a Death Eater - making them brothers would require a great deal of imagination and explanation. The writer would need to explore how this new relationship would affect the plot, the other characters, and the overall themes of the story. It might also change the way we view the magical world's social and political structures as they are presented in the books.
Yes, there might be such fanfictions in the vast world of fan - created content. Fanfiction writers often come up with creative and unexpected relationships between different fictional characters. However, the popularity and availability of a specific 'Harry Potter is Carlisle brother' fanfiction can vary greatly. You may need to search on dedicated fanfiction websites to find out for sure.
Well, it could make him more independent. Without the initial love and protection from his parents, Harry has to learn to fend for himself at a very young age. So when he gets to Hogwarts, he might be more likely to take risks and not rely on others as much.