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.
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.
No. Naruto is known for his kind heart and strong sense of justice. In the original series, he always tries to understand his opponents and save them rather than being a heartless killer.
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, it could imply that the fanfiction about Naruto is lacking in emotional depth or empathy. Maybe it portrays the characters in a cold or unfeeling way, not in line with the original spirit of the Naruto series.
No. Most Naruto fans appreciate the original values of the series, like friendship, perseverance, and kindness. A fanfiction portraying Naruto as heartless goes against the core of the character, so it's not likely to be a common view.
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.
Maybe Naruto has been through some extremely cruel experiences that make him lose his compassion. For example, he might have witnessed the repeated betrayal of his friends, which gradually hardens his heart.
There are also some Naruto - dedicated fan forums where fans share their own fanfictions. Some of these might be about a heartless Naruto. You can search for Naruto fan forums and then look for the fanfiction section within them. However, make sure to follow the rules of the forum.