Sasuke could be an interesting choice. He already has a complex personality and adding the mind control bloodline to his abilities would make his character even more multi - faceted. He could use it to further his revenge plans or, in a different turn, to protect his friends and the village.
Naruto himself could also be the main character with this new bloodline added to his repertoire. It would be a great twist on his character. He might struggle with the moral aspects of using mind control, but also find new ways to bring peace to the ninja world with this power.
Well, in such a fanfic, the origin of the mind control bloodline can be a really fascinating aspect. It could be an ancient power that was lost and rediscovered. This could lead to a whole story arc about the search for the knowledge to master this power. And perhaps it has some connection to an old clan that was once feared for their mind - controlling abilities.
It could be a new character created specifically for the fanfic. Maybe an orphan who discovers they have this unique portal bloodline and has to navigate the Naruto world while hiding their power from those who might want to use it for evil.
Naruto himself could be the main character with a devil bloodline twist. Maybe he was born with it but it was hidden until a certain event triggered it. This would completely change his journey. Instead of just trying to gain the respect of the village as a Jinchuriki, he would also have to deal with the implications of having a devil bloodline, which might be seen as even more dangerous by some in the village.
In Naruto fanfiction, the mind control bloodline can have a huge impact on character relationships. If a ninja uses the power to make another ninja do their bidding, it can lead to mistrust among their comrades. They might start to question who they can really trust. Moreover, if a character is mind - controlled into betraying their clan, they will face a lot of difficulty in being accepted back. Their family and friends will have to grapple with the fact that the betrayal wasn't entirely their fault, but still, there will be a sense of unease and a need to rebuild the relationship.
A Titan who has escaped from Tartarus could be a potential mind - controller. Titans are powerful beings, and one of them might use mind control to try and regain their former power. For example, if a Titan could control Percy Jackson, they could use his abilities to start a war against the gods. Also, a powerful nymph who has been mistreated by demigods might use mind control to get back at them. She could manipulate Percy's mind to make him do things that would harm the demigod community.
One popular plot could be a character with a new bloodline that allows mind control trying to take over the Hidden Leaf Village. They might start by targeting key ninjas like Kakashi or Shikamaru. Another plot could involve a villain using the mind control bloodline to turn the ninja clans against each other. And there could also be a plot where a young ninja discovers they have this bloodline and has to struggle with the power and the temptation to use it for wrong reasons.
Another option could be a relative of an existing character. Maybe a long - lost cousin of Sasuke who has the Bakuton bloodline. This would add an interesting dynamic to the existing relationships in the Naruto story. They could initially be on a different path, but through the power of the Bakuton bloodline, their path crosses with the main characters.
An orphan with no known family could be the main character. They discover they have a hidden bloodline through a series of events. It could be a bloodline that gives them the ability to see the past or future in dreams. This character would then be on a journey to figure out where they came from and what their power means, all while trying to fit into the ninja society.
Sasuke could also be a great main character for this kind of fanfiction. With his already complex character arc in the original series, adding the kami bloodline to his story could take it in new and exciting directions. He could struggle with the power of the bloodline, perhaps fearing it would make him too much like those he has fought against in the past, or he could use it to seek revenge in a more powerful way than before.
It could be Sasuke. He already has a thirst for power and a complex backstory. Discovering an Espada bloodline would add another layer to his character. He could use the new powers to seek revenge in a more powerful way or perhaps find a new purpose in protecting the village instead of just avenging his clan.