How does this admission in the fanfiction change Naruto's character?

It changes him by making him more unpredictable. Normally, Naruto is very determined and straightforward. But as the Joker, he becomes someone who thrives on chaos. He might not have a clear goal like he did before, but rather just enjoys causing disruptions.

Fullbring might make Naruto more empathetic. If his fullbring is connected to someone else's emotions or memories (which is possible in some interpretations of fullbring), he would gain a deeper understanding of others. This could change his relationships with his friends and enemies alike. For instance, he might be more forgiving towards his foes if he can sense the pain that led them to their actions through his fullbring.

In these fanfictions, Naruto's character experiences a significant shift. Firstly, his sense of adventure takes on a new form in the SAO world. He is no longer just exploring the hidden villages and fighting ninjas but is now delving into the digital landscapes of SAO. When it comes to the harem, his usually brash and straightforward personality mellows a bit. He has to be more delicate in handling the emotions of the female characters in his harem. This makes him more patient and understanding. He also starts to rely more on his wits in the SAO world rather than just brute strength as he has to figure out the virtual world's mechanics. His loyalty also extends to his new friends and potential love interests in the SAO harem, which is an expansion of his already strong sense of loyalty from the Naruto series.

Naruto's confidence also takes a different turn. He is no longer just relying on his regular jutsu. With Meiton, he has a new sense of power, but also new responsibilities. He might be more cautious in battles, knowing that his Meiton attacks could have far - reaching consequences. In some fanfictions, this makes him seem more mature as he weighs his actions more carefully.

Naruto might become more reserved. Since ice is often associated with coldness, he may not be as outgoing as in the original story. He could be more cautious about showing his emotions.

Well, in this fanfiction, Naruto's self - confidence could take a different turn. Being born as a kitsune gives him a special identity from the start. He might not have the same insecurities as in the original story. Instead, he could be more self - assured, knowing he has unique powers. However, he might also face new challenges in controlling his kitsune powers, which could lead to some internal struggles as he tries to balance his new abilities with his old values.

With foresight, Naruto becomes more cautious. He can't just rush into things as he used to. For example, if he foresees a trap, he'll avoid it instead of blindly charging in.

In fanfiction, the fox contract can make Naruto more confident. Since he has this special connection with the fox, he might feel like he has an edge over his opponents. This new - found confidence could show in his battles and how he interacts with others.

He becomes cold towards others. He no longer shows the warm smiles and friendly greetings that he used to. Instead, he might ignore people or give them cold stares.

Naruto's character may become more adaptable. Since he has to deal with being a slime, he'll need to quickly adjust to a completely different form and way of life. He might lose some of his brashness as he realizes he can't just charge into situations like he did as a ninja.