In fanfiction where Yugi gets Yami's shadow magic, how does it change his relationship with his friends?

Well, it depends on how the fanfiction portrays it. In some cases, his friends could turn against him completely. They might see him as a danger to the wizarding world. But in more positive portrayals, they would see this as just another challenge for Harry to overcome. They would be there for him, but it would be different. For instance, they might have to help him find new ways to do magic since the vampire bite could potentially affect his magic in some ways. Their relationship would be a mix of loyalty and a new kind of understanding as they all deal with this unexpected change in Harry.

Well, his friends would probably become more protective. They might see him as a vulnerable little being that needs constant care. Donald and Goofy, for example, would likely be extra vigilant in keeping him safe from any danger in the different worlds they visit.

Harry might be more protective of his friends in the new timeline. He has seen what can happen to them in the future, so he'll do everything he can to keep them safe. With Hermione, he could encourage her to pursue her interests more freely, knowing how important her knowledge and skills will be. And with Ron, he may try to boost his confidence from the start, so Ron doesn't feel overshadowed as he did in the original timeline.

If Seto is watching Yugi for Yami, it could lead to a more complex relationship. Seto might start to see Yugi in a different light, perhaps not just as an opponent but as someone with a unique bond with Yami. This could lead to a grudging respect for Yugi.

His relationship with some friends might become strained. For instance, if Naruto decides to leave Konoha, some friends who are more loyal to the village might oppose his decision. However, his true friends will try to understand his reasons. Sakura, for example, might initially be shocked but then come to terms with it as she has seen Naruto's struggles.

Well, in Slytherin, Harry could end up being one of Snape's top students. This might lead to a more positive relationship. Snape might see Harry as a chance to redeem the Slytherin image. He could start to trust Harry more and share some of his knowledge about dark magic in a more open way, which was not possible when Harry was in Gryffindor.

Naruto's blindness would surely transform his relationships. His friends would need to adapt. Shikamaru, being the intelligent one, might come up with strategies to help Naruto move around safely. Choji could share his food more often to cheer Naruto up. Ino might use her mind - transfer jutsu in new ways to assist Naruto. His friends would become his eyes in a way, and this new dynamic would deepen their friendships as they all work together to support Naruto in his new situation.

His relationship with Sasuke might become more competitive. Since they are both aiming for higher levels of ninja skills, they would constantly push each other. With Sakura, Naruto might be more respected as he has achieved the Chunin rank, and she could see him in a new light.

Perhaps Yugi gets Yami's shadow magic and starts to have strange dreams. In these dreams, he sees visions of ancient battles where the shadow magic was first used. Through these dreams, he gradually learns more about the true nature and potential of the magic, and how it can be used for both good and evil. This knowledge then shapes his use of the magic in the real world.

His friends might be a bit more cautious around him at first. After all, the Kyuubi is a very powerful and somewhat feared entity. But as they see that Naruto is still himself, they gradually become more accepting. For example, Sasuke might initially be on guard but then realize Naruto is still his friend.