Harry would likely become more confident in his pure - blood heritage. Growing up with Narcissa, he'd be exposed to different values and traditions, which could make him more well - rounded. He might also be less impulsive as he'd be in a more controlled environment.
If Narcissa adopts Harry, his character would develop a more nuanced view of the wizarding world. He'd see the good in Slytherin - like qualities that Narcissa would instill in him. For example, he'd be more strategic in his decision - making. Also, his relationship with the Weasleys and Hermione might change as he'd be in a different social circle. His loyalty would be tested as he tries to balance his new family with his old friends.
It would change Harry a great deal. He'd have a different upbringing than the one he had with the Dursleys. Narcissa would likely educate him in a more refined and wizard - centric way. Harry would probably be more reserved and calculating. His sense of justice might be influenced by Narcissa's views. He might still oppose Voldemort but in a more calculated and less hot - headed manner. His relationship with Draco would be completely transformed, and they could end up being friends or even like brothers, which would have a huge impact on how he interacts with others at Hogwarts.
Perhaps in the fanfic, Narcissa adopts Harry because she has a change of heart after seeing the destruction Voldemort causes. She wants to protect Harry as a way to atone for her family's association with the Dark Lord. Harry would then grow up in a Slytherin - influenced environment but still hold onto his Gryffindor values. This would lead to interesting interactions with other Slytherins and a different dynamic within Hogwarts.
The blood adoption might make Harry more introspective. He has always been a bit impulsive, but with Snape's influence through the adoption, he may start to think more before acting. For example, he might analyze situations from different angles like Snape used to.
Harry's character would likely become more refined. With Narcissa's training, she might pick up on the pure - blood's sense of propriety. She could also become more confident in her magical abilities. For example, if Narcissa teaches her advanced dueling techniques, Harry would be less hesitant in battles.
Loki's mischievous personality could make Harry more adventurous. Harry might start to take more risks in his magical studies and in facing Voldemort. For example, he could be more willing to try out untested spells or strategies.
It would likely make Harry more in touch with his emotions. Princess Luna is associated with the moon and dreams, which are often linked to the subconscious. Harry might become more introspective. For example, he could learn to face his inner demons better under Luna's guidance.
Harry would likely become more confident under Amelia Bones' care. Since she is a strong - willed and capable witch, her guidance would give Harry a sense of security. He might develop a more strategic way of thinking, influenced by her experience in the wizarding world.
One possible plot could be that Harry grows up with a different perspective on the wizarding world. Narcissa might shield him from the more extreme pure - blood ideologies in her own family. He could still have his natural talent for magic but be trained in a more Slytherin - like way, focusing on cunning and self - preservation. And he might have a different relationship with Draco, perhaps more of a brotherly bond.
His personality might become more reserved. Growing up in the Malfoy household, he'd be surrounded by Slytherin values. So he could be more calculating and less impulsive compared to his original self. But he would still have that core of kindness from his parents.
In some fem Harry Potter fanfics, Narcissa can become more of a protector. For instance, if the story involves a female Harry Potter who is in danger, Narcissa might step up in ways she didn't in the original series. She could be more assertive in using her influence within the Death Eater circles to safeguard Harry.
In the case of characters like Draco Malfoy, age regression could completely change his trajectory. He might not have the same prejudices if he were in a younger mental state. He could form new friendships, perhaps with characters from different houses. This would not only change his own development but also the way other characters view him. His relationships with his parents might also be affected, as he might show a side of himself that they haven't seen before, which could lead to either a closer bond or more conflict depending on how they react.