If Harry absorbs the memories of his enemies, it could make his relationships with other characters more complicated. For instance, if he absorbs the memories of Draco Malfoy, he might understand Draco's family pressures better. This could lead to a more complex relationship where Harry has both sympathy and still some animosity towards Draco.
It might make his friends a bit wary at first. Since this is an unusual and powerful thing to happen, they could be concerned about how it's changing Harry. But as they see that Harry is still the same person deep down, they would gradually accept it.
When Harry absorbs the Goblet of Fire in fanfiction, it could open up new areas of magic for him. He might be able to access spells that are related to fire and heat that were previously unknown to him. His magic could become more attuned to the element of fire, allowing him to sense things related to fire in the wizarding world. This could include detecting hidden fire - based traps or finding objects that have a connection to fire magic.
With his friends, it could initially cause confusion. They are so used to calling him Harry that the new name might be a bit of a shock. But if they understand his reasons, they would likely support him. For example, Hermione might be the first to adapt and help others adjust, using her logical thinking to see the benefits of the name change.
His relationship with Ginny might be affected. Ginny could be very protective of him and worry a great deal. This could lead to some sweet, tender moments between them as she takes care of him during his seizures.
His relationships with his friends like Sasuke and Sakura would be deeply affected. They might feel like they've lost a part of Naruto. Sasuke, for instance, might initially be frustrated as he's used to Naruto's determination. Now, with his memories gone, Naruto might seem like a different person to Sasuke.
In some fanfictions, his magic absorption makes his friends a bit wary at first. For example, in 'The New Harry', when he starts absorbing magic uncontrollably, his friends like Ron and Hermione are worried about his safety and the implications. But as he learns to control it, they become more supportive and help him use it for good.
In this fanfiction scenario, Harry's relationship with Dumbledore could be very interesting. Dumbledore would surely be aware of the significance of Excalibur. He might take Harry under his wing even more, guiding him on how to use the sword's power for good. Harry's relationship with the other Hogwarts students could also change. Some might look up to him even more, while others might fear him because of the great power he now wields.
If Harry is sleepwalking, it might worry his friends. For example, Hermione would probably be very concerned and try to find a way to stop it. This could strengthen their friendship as she devotes time to helping him. Ron, on the other hand, might initially find it funny but then also realize the seriousness. It could also make some of his classmates more curious about him, which could either bring them closer or create some distance depending on how they react to his sleepwalking episodes.
His relationships with his teachers could also change. Dumbledore might look at Harry with more sympathy and offer him different kinds of guidance. Snape, although still prickly, might secretly respect Harry more for enduring this new hardship, or he could use it as an excuse to be even more critical, thinking that Harry is now more likely to make mistakes.
Well, it really depends on how the fanfiction portrays it. If Naruto absorbs his dark emotions in a way that makes him seem cold or emotionless, it could strain his relationships. His friends are used to his passionate and sometimes impulsive self. But if he manages to balance it well, it could also make him a better listener and friend. He'd be able to offer more rational advice and support without being clouded by his own negative feelings.