In the original Naruto story, the Hidden Leaf Village supports Naruto for the most part as he progresses. But in this fanfiction, if Naruto is feared, then the village's attitude towards him would be completely different. There would be no more of that sense of community and support. Instead, there would be suspicion and fear among the villagers. This alters the entire backdrop and emotional tone of the story compared to the original.
Well, in the original Naruto story, Naruto is mostly seen as a hero or an underdog trying to prove himself. But in this fanfiction, he is feared. This is a huge deviation. The original Naruto is all about friendship, hard work, and believing in oneself. In the fanfiction, it seems to focus more on the negative perception of Naruto, which changes the whole dynamic of his character relationships.
In some fanfictions, Naruto might be feared due to his overwhelming power. For example, if he has some new and extremely dangerous jutsu that others can't understand or counter. It could also be because he has changed his personality to be more cold - blooded and less forgiving, which is a departure from his original kind - hearted self in the official story.
The character dynamics are likely to be very different. In the original, Naruto is seen as an underdog trying to gain recognition. As a monster in the fanfiction, he might be feared or shunned, which is a huge departure from the original story where he gradually earns respect through his hard work and determination.
The original Naruto story doesn't depict Naruto as bipolar. So in this fanfiction, it's a major deviation. His stable and determined character in the original is replaced with a more erratic one.
The original Naruto story shows Minato as a hero and a loving father. In fanfiction with abuse, it completely goes against this. It changes the core relationship between Minato and Naruto.
The original Naruto story has a set of rules regarding the nature of chakra, ninjutsu, and the relationships between different species and entities. In the 'naruto impregnates kyuubi fanfiction', all these rules are thrown out the window. It's a huge deviation as it brings in a concept that is not only inappropriate in the context of the original Naruto story but also changes the fundamental understanding of the characters and their capabilities. For example, the Kyuubi is no longer just a source of power for Naruto but is now involved in a very different kind of relationship that was never even hinted at in the original series.
The original Naruto story is about ninja adventures, friendship, and Naruto's growth. The fanfiction you mentioned involves inappropriate and non - canon sexual themes which have no place in the original Naruto universe. It completely changes the nature of the story and the characters.
In the original story, Naruto loves ramen. It's a big part of his character. So in this fanfiction, it's a complete opposite. It changes the fundamental aspect of his relationship with food.
In the original Naruto, the characters are constantly building relationships and working together. But in antisocial fanfiction, Naruto may be shown as rejecting these relationships. He could be written as being bitter and cynical, which is a far cry from the optimistic and determined Naruto we know. This deviation changes the overall feel and message of the story, moving away from the themes of unity and hope that are central to the original.
In the original Naruto story, Naruto has deep friendships with both Sakura and Sasuke. He loves Sakura in a pure way and is constantly trying to bring Sasuke back to the village. In the fanfiction where he hates them, it completely flips his character's fundamental relationships. It goes against the essence of his character development, which was based on his bonds with them.
The most obvious deviation is Naruto's identity as a hanyou, which is completely different from the original. In the original, he is a human ninja. Also, the presence of vixens is new. In the original Naruto, there are no such characters.