Sasuke is often a popular character in such fanfictions. His natural abilities and his connection to the Sharingan make him a prime candidate for exploring the concept of copied bloodlines. Writers might have him encounter situations where he has to deal with someone who has copied his bloodline or vice versa.
Kakashi is another character that might be popular. His Sharingan and his reputation as a skilled ninja make him a great addition to stories about bloodline copying. He could be a mentor figure to someone who is just starting to explore the world of bloodline copying, or he could be involved in a plot where his own Sharingan abilities are somehow enhanced or changed through the concept of bloodline copying.
Yes, in fanfiction, Naruto can often be depicted as having the ability to copy bloodline limits. Fanfiction writers like to explore different scenarios and expand on the characters' capabilities, and Naruto's ability to copy jutsu makes it somewhat plausible in this fictional realm.
The idea of characters using copied bloodlines to break the traditional power hierarchies in the Naruto universe is also quite engaging. They could use these abilities to challenge the established clans and their dominance, opening up a whole new set of power dynamics and political intrigue within the fanfiction.
In some naruto bloodline copy fanfiction, there might be a plot where the ability to copy bloodlines is not limited to just the main characters. This could cause chaos in the ninja world as more and more people start using powers they weren't originally supposed to have. It would be interesting to see how the different ninja villages deal with this new threat or opportunity.
One implication is that it makes Naruto extremely powerful. He can gain access to unique abilities that were previously exclusive to certain clans. For example, if he copies the Uchiha's Sharingan powers, he could gain enhanced perception and the ability to use powerful genjutsu.
There are also fanfictions where a bloodline is created through some sort of experimental jutsu. For example, a bloodline that allows the user to transform into different elements at will. This would give the character an edge in combat as they could adapt to any situation by changing their form.
The knight bloodline could be integrated as a foreign power that was brought to the Naruto world long ago. Maybe a group of warriors from another dimension with the knight bloodline came and settled, and over time their bloodline got diluted but still resurfaces in certain individuals.
He might use some special jutsu or seals. For example, he could use a sealing technique to suppress the signs of his bloodline. This way, others wouldn't be able to detect it through normal means like sensing chakra.
It could also be part of a strategic move. By hiding his bloodline, he can surprise his opponents in battle. They would underestimate him based on not knowing about his true powers, and then he could turn the tables on them when the time is right. This gives him an edge in combat situations.