Well, a 'Harry raised by Andromeda' fanfic can completely transform the original story's plot. Andromeda, being a Black, has her own connections and knowledge of the wizarding world. She can introduce Harry to different aspects of magic and magical families that he might not have known otherwise. His growth as a wizard is different. He may not rely as much on his friends for emotional support as he gets it all at home. This can change the dynamics of his friendships at Hogwarts. Also, in the battle against Voldemort, Harry may have different resources and allies due to Andromeda's influence.
In a 'Harry Potter raised pureblood' fanfiction, the story often changes in terms of Harry's magical education. He might receive a more traditional pureblood education, which could include learning ancient spells and magic that were lost in the mainstream wizarding world. This gives him an edge and changes the power dynamics in his battles against Voldemort. For example, he could use some pureblood - only defensive magic that Voldemort isn't expecting.
It changes the story by expanding the scope of Harry's world. Instead of just Hogwarts and the UK wizarding world, he's now part of an international magical community. His values and beliefs are likely to be more diverse.
Often, it changes the power dynamics. Instead of growing up with the Dursleys, Harry might grow up in a completely different environment, which gives him different skills and knowledge. For example, if he's raised by magical creatures, he could have a deeper understanding of nature magic.
Often, it changes the original plot by allowing Harry to prevent certain deaths. For example, he might go back in time to save Sirius Black or Dumbledore. This alters the emotional landscape of the story significantly.
It changes the power dynamics. In the original story, Harry is just a normal wizard with a special destiny. But when raised by Death, he may have access to powers beyond normal magic. He could be more in tune with the darker aspects of magic, like necromancy in a non - evil way. For example, he might be able to control or communicate with ghosts in a more profound way.
Well, this type of fanfiction changes the original story in multiple ways. Firstly, the character of Harry is likely to be more reserved and perhaps more studious under Snape's care. Snape, being a strict teacher, would enforce discipline in Harry's study of magic. Secondly, the whole mystery around Harry's parents and his role in the wizarding world might be revealed to him in a different order. Since Snape has his own secrets and grudges related to James Potter, he might tell Harry things in a different light compared to Dumbledore. Moreover, the relationship between Snape and the other Hogwarts faculty would also change. They would have to accept Snape as Harry's guardian, which could lead to some interesting power dynamics and storylines at Hogwarts.
A fanfic with Cedric and Harry as brothers would change the Hogwarts experience for both of them. They could share a dormitory or have special family - related privileges at school. Their bond as brothers would likely make them more of a united front against the likes of Voldemort. Instead of Harry being the sole focus of Voldemort's attention, Cedric would also be in the crosshairs. This would lead to different strategies and plot developments. The Weasley family might interact with them differently too, as they would be related to Harry in a different way. And the relationship between Harry and Cho Chang (who was Cedric's girlfriend) would be completely reimagined, adding a whole new layer of complexity to the story.
The concept changes the original story a great deal. Firstly, Harry's personality would be different. Instead of the kind - hearted boy we know, he might be more cynical due to IT's influence. Secondly, his relationships would change. His friends might be more wary of him. Also, the way he approaches magic could be altered. He may use magic in more unorthodox and perhaps darker ways.
The fanfiction might also change the original plot by introducing family - centered subplots. Since Harry has a sister, there could be more focus on the Potter family history and legacy. Maybe the sister discovers something about their parents that Harry didn't know before. This can lead to a whole new set of quests and revelations, as they try to understand their family's past better. Also, the sister's existence can influence the way Voldemort views the Potters. He might see her as another threat or as a means to get to Harry, which changes the nature of their conflict.
When raised by Death Eaters in fanfiction, Harry's moral compass could be completely distorted. He might struggle with his identity, being torn between the good he was born with and the dark teachings he received. This would lead to a very complex and different plot as he tries to find his true self.