Sasuke is often involved. Since he and Naruto have a complex relationship, Sasuke might react in various ways to Naruto's newfound power from the hidden bloodline. He could be jealous or see it as a new challenge to overcome in their rivalry.
Kakashi is another common character. As Naruto's teacher, he would play a crucial role in guiding Naruto to understand and control his hidden bloodline powers. He might also be the one to discover the true nature of Naruto's bloodline first.
Jiraiya could be involved too. Given his role as Naruto's mentor and his vast knowledge, he would likely be interested in Naruto's hidden bloodline. He might research about it, try to find out where it came from and how to further develop Naruto's powers related to it.
Obviously Naruto is the main character. Sasuke is often involved as well. Since Naruto's new bloodline power can change the power dynamics in their relationship. Sakura might also be there, perhaps helping Naruto to control his new abilities. Kakashi could play a role too, guiding Naruto in understanding and using the power of his awakened bloodline.
Gaara could be one of the characters. He has a bond with Naruto and if Naruto is against Konoha, Gaara might get involved to help Naruto or at least try to mediate. Shikamaru is another likely character. His intelligence would make him a key figure in trying to understand Naruto's motives and also in devising strategies for Konoha. Hinata might be involved as well, because of her feelings for Naruto. She might try to protect Naruto from Konoha's attacks.
Well, one interesting plot development could be that Naruto discovers his hidden bloodline has a unique power that allows him to communicate with ancient spirits. This new ability could lead him to uncover secrets about the ninja world's past and give him an edge in battles against powerful foes.
Sasuke could be involved. Since they have a complex relationship, Sasuke might either be a rival during Naruto's training, pushing him to be better, or he could end up joining Naruto in some training sessions to become stronger together.
Sasuke is an obvious choice. He has a connection to Naruto that goes beyond just friendship or rivalry. He might be the one who first discovers Naruto's predicament and sets out to find a solution. Sakura is essential too. Her skills as a medical ninja are crucial. She could be the one who patches Naruto up every time he gets injured in his fight against whatever is threatening his life. Also, characters like Jiraiya might make an appearance. Even though he's dead in the original story, in this fanfiction, he could come back as a spirit guide to help Naruto find a way to 'refuse to die', giving him advice based on his own knowledge and experiences.
Sasuke is likely to be involved. He and Naruto have a complex relationship and Sasuke has become an ally. He could offer his strength in combat to protect the rebuilding efforts. Also, Sakura. She's a skilled ninja with medical abilities that could be useful if there are any injuries during the process.
There might be characters from Iwa who oppose Naruto. For example, the Tsuchikage of Iwa would surely be involved as the leader of the village Naruto is attacking.
Sasuke is likely to be involved. Given their complex relationship, Sasuke might be on the receiving end of Naruto's rage at times or be someone who tries to understand and calm him. Kakashi could also be there, as Naruto's sensei, he would surely be involved in dealing with Naruto's rage.
Sasuke is often involved. Since Naruto and Sasuke have such a complex relationship, in this 'beyond godlike' scenario, Sasuke might be either a rival trying to match Naruto's new powers or an ally helping him control or use them. Another common character is Kakashi. He could be Naruto's mentor in understanding and managing these extreme powers.
Sakura could be involved. She could be like a healer or an advisor in the new world. Her medical skills would be very useful. Also, Sasuke might be there. He could be a sort of enforcer, using his Sharingan to detect threats. In the world of Asgore, they could form a new kind of team, with Naruto as the leader like Asgore. And then there could be characters from Asgore's world like Toriel. She could be a guide to Naruto about the culture and history of the place.