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.
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.
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.
Narcissa's family connections make her interesting. She's a Malfoy, married to Lucius and mother of Draco. In fanfic, this gives writers a lot to work with in terms of family drama and loyalty. For example, she has to balance her loyalty to the Dark Lord with her love for her son.
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.
The abuse makes Harry more cautious. He has learned from the Dursleys that the world can be cruel, so he's careful about who he trusts. For example, he might be hesitant to open up to new people he meets at Hogwarts.
One good fem Harry Potter Narcissa fanfic could be 'The Hidden Bond'. It explores a different dynamic between a female Harry Potter and Narcissa. In this fic, their relationship starts off as a mystery but gradually unfolds into a complex bond that affects the entire wizarding world around them.
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.
Well, it could make Harry more independent. Without Dumbledore's guidance, he has to rely on himself more. He might become more cautious as he no longer has that safety net. He could also grow to be more distrustful of authority figures since the one he trusted most has left him.