Well, clearly Naruto is one of the main characters as he is named in the title. Haruki is also likely a main character. It's possible that there could be other characters from the Naruto universe involved as well, like Naruto's friends such as Sasuke or Sakura. However, without reading the fanfiction, it's hard to say for sure if they play significant roles. But Naruto and Haruki are the ones that stand out from the title itself.
Based on the title, Naruto and Haruki are likely to be the main characters. Naruto is from the original Naruto series, and Haruki seems to be a character created for this fanfiction.
I'm not sure specifically as I haven't read that exact fanfiction. But generally, in Naruto fanfictions, it could be about Naruto and his friends saving lives in a new or different scenario. Maybe it involves Haruki (who might be an original character in this fanfic) joining Naruto on some life - saving missions or something similar.
While Naruto and Sasuke are the main focus, other characters could also play important roles. For instance, Sakura might visit them, which could create some interesting dynamics. Kakashi could also drop by to check on them and offer his guidance. But overall, it's Naruto and Sasuke's relationship that will be at the heart of the story.
Obviously, Naruto in his fox form would be one of the main characters. He would have different abilities and behaviors compared to his human self.
Obviously, the foxes would be the main characters. There could be an old, wise fox that acts as Naruto's mentor among them. It could have a name like Kyo, and it would be the one to teach Naruto the most important lessons.
Obviously Naruto is one of the main characters. And then, there would be the Eevees. There could be a special Eevee that stands out, like an Eevee that is more curious about Naruto than the others and becomes his closest companion among the Eevees.
Obviously, Kushina and Naruto are the main focuses. Kushina because she's the one who is alive in this fanfiction concept, and Naruto because he now has his mother in his life. Their relationship is often explored deeply, showing how Kushina can guide Naruto in his ninja journey and in life in general.
While Naruto and Gohan are the central focus, the fanfic could also introduce new characters created specifically for this story. These new characters could be neighbors or someone who is affected by the presence of Naruto and Gohan living together, which would then drive the plot forward in new and unexpected ways.
Obviously Naruto himself. There could also be the temple's caretaker, an old wise man or woman who guides Naruto in his stay there.
Obviously Naruto would be one of the main characters interacting with him. Naruto would look up to Sarutobi as a mentor and a source of knowledge. Their interactions could range from training sessions to deep conversations about the future of the village.
Bella herself is obviously a main character. And then, depending on the direction of the fanfiction, it could be a new character created by the author. This new character could be the one focused on saving Bella. There might also be appearances from the original Twilight characters like Edward or Jacob, but they could have different roles compared to the original story.