Naruto himself might struggle with the moral implications. Controlling another being, even if they are heartless, can be a tricky moral ground. He may question whether it's right to do so, and this internal conflict could also be a challenge for him as he tries to figure out how to effectively control the heartless.
Another issue could be resistance from other forces. There might be some dark entities or villains who don't want Naruto to control the heartless. They could try to stop him, either by directly attacking him or by using their own powers to counteract his control methods.
One challenge could be that the heartless have a very different nature compared to the beings Naruto is used to dealing with. Their lack of emotions might make it difficult for him to find a way to connect and control them.
Well, in some fanfictions, Naruto might control the heartless through his strong will and the power of his chakra. Maybe he uses some new jutsu he developed specifically for this purpose.
In fanfiction, it could be through his strong chakra control. Naruto has always had amazing control over his own chakra, and perhaps he can manipulate the 'heartless' by infusing his chakra into them in a certain way, influencing their actions or behaviors.
Naruto could face several challenges. Firstly, the mental strain of controlling such powerful entities. The bijuu have their own consciousness and desires, and keeping them in check mentally can be exhausting. Secondly, there's the issue of mastering different forms and abilities of the bijuu. Each bijuu has unique powers, and learning to utilize them effectively without losing control is no easy feat. Moreover, he may face social challenges as some in the ninja world may not trust him with this much power and try to undermine his control.
A great 'Naruto Control Heartless' fanfic is 'Naruto: Heartless Redemption'. This story delves deep into Naruto's psyche as he tries to control his newfound heartless nature. It starts with Naruto experiencing a great loss that causes him to shut off his emotions. As the story progresses, he has to learn how to balance this new side of him with his true self. The fic also has some amazing fight scenes where Naruto uses his heartless state to his advantage, making for a really engaging read. It also explores the relationships he has with his friends and how they react to this change in him.
The main character is usually Naruto in 'Naruto Control Heartless' fanfics. However, other characters like Jiraiya can be crucial too. Jiraiya might be shown as a mentor figure trying to understand what has happened to Naruto and help him. Additionally, characters from the Akatsuki, like Itachi, can be involved as their motives and actions can be intertwined with Naruto's new heartless self. For example, Itachi's past actions and secrets could have an impact on how Naruto views the world in his heartless state.
One challenge Naruto might face is Gaara's past traumas. Gaara has been through a lot of pain and isolation, which has made him distrustful. It would be difficult for Naruto to break through those barriers and get Gaara to open up. Another challenge could be the political situation. Suna and Konoha have had their differences in the past, and some in Suna might not be happy with Naruto's influence on Gaara. Naruto would have to deal with any potential political unrest or opposition from those who don't trust Konoha.
Naruto would likely struggle with Hinata's shyness. He is a very outgoing person, and suddenly being in a body that is naturally more reserved could be difficult. For instance, when interacting with other characters, he might accidentally come across as too forward or too quiet, which could lead to misunderstandings. Also, Naruto would have to deal with Hinata's personal relationships. Her friends and family know her in a certain way, and any changes in behavior due to Naruto's possession could cause concern or confusion among them.
Perhaps a dark power corrupts him. In the fanfiction, there could be some sort of dark chakra or evil entity that latches onto Naruto. This entity could slowly eat away at his emotions, starting with his heart, making him gradually lose his ability to feel empathy and turn heartless.
Well, for Naruto in this fanfiction, a major challenge would be dealing with the recoil of Raikiri. Since it's a powerful jutsu, it likely has a significant recoil effect on the user. Naruto would need to learn how to manage that so he doesn't get hurt every time he uses it. Also, in the world of fanfiction, there could be other ninja who don't want Naruto to learn Raikiri. They might try to sabotage his training, which would be an external challenge he has to face. And let's not forget that Naruto has his own unique fighting style. He would need to find a way to integrate Raikiri into his existing style without losing his edge in combat.