He could be characterized as more withdrawn in social situations. He might seem to be in his own world at times, thinking deeply about things that others don't understand. For example, he could be constantly analyzing the patterns of chakra flow in a way that seems obsessive to others.
In these fanfictions, Naruto often has enhanced combat abilities. The Crystal Release gives him a new way to attack and defend, like creating crystal structures for protection or sharp crystal shards as weapons.
A plot development might involve Naruto struggling to control the Rinnegan at first. Sasuke, noticing this, believes he can defeat Naruto easily with his Sharingan. But as Naruto starts to master the Rinnegan, he shows new abilities that shock Sasuke. This could lead to a situation where they have to team up against a common enemy who is after the power of both the Rinnegan and the Sharingan. Or perhaps a prophecy is revealed that states only one of them can keep their dojutsu power and they must fight to decide who keeps it, leading to a moral and power - based struggle.
Often, they emphasize the loyalty between Naruto and his ninken. For example, in many such fanfictions, the ninken will stand by Naruto no matter how difficult the situation is.
They usually introduce new animal species or expand on the existing ones in the Naruto world. Like there could be some rare, powerful animals that only Naruto can befriend. These animals might have unique abilities such as the power to heal or to create illusions on a large scale.
A 'Naruto has slaves' fanfiction would have several implications. First, it would go against the core values of the Naruto world. Second, it might give the wrong impression to new fans or those not familiar with the series that the Naruto universe has such dark and unethical elements. Third, it could create a rift in the fan community as some might find it interesting from a creative 'what - if' perspective, while others would find it deeply offensive and against what Naruto stands for.
I'm not entirely sure specifically what a 'naruto has a sinbot fanfiction' is about without reading it. It could potentially be a fan - created story where Naruto encounters a sinbot, perhaps a character or entity related to sin in some way, and the story might explore how Naruto deals with this new and strange element in the Naruto - inspired fictional world.
I'm not sure specifically as there could be many different interpretations in such a fanfiction. It might involve Naruto somehow coming into possession of a kwami, perhaps leading to new powers or adventures. Maybe he has to deal with the responsibilities that come with having a kwami, like a Miraculous in the Miraculous Ladybug universe.
Typically, in 'Naruto has augments' fanfiction, Naruto gets some sort of extra abilities or enhancements. This could be physical like super strength or speed, or it could be related to his jutsu, making them more powerful. For example, he might gain the ability to control an element more efficiently or in a new way.
In some fanfictions, one of the bloodline limits could be something like a super-enhanced Sharingan-like ability. Another might be a power related to controlling natural elements in a unique way, for example, a more powerful form of water control. And perhaps a bloodline limit that gives Naruto the ability to instantly teleport short distances. However, different fanfictions can have very different interpretations of these six bloodline limits.