Kakashi could also be a great help. With his vast experience and wisdom, he could guide Naruto in understanding the implications of becoming a new species. He might be able to teach Naruto how to control any new powers that come with the transformation and how to deal with the potential social isolation.
Maybe Naruto could gain some unique powers. For example, if he becomes a new species like a dragon - like being, he might be able to fly and breathe fire, which would completely change the way he battles and protects the village.
In a 'Naruto Needs Help' fanfiction, Naruto could get help from unexpected sources. The tailed beasts themselves could come to his aid. Since Naruto has a connection with Kurama, the other tailed beasts might sense his distress and offer their power. Also, characters from other villages. For example, Killer Bee could teach Naruto some new techniques related to the tailed beasts' power, or Temari could use her wind techniques to assist in a battle where Naruto is outnumbered.
Naruto might gain the power of shikai and bankai. Shikai is the first release of a zanpakuto's power, and bankai is the ultimate form. Naruto, with his determination and strong will, would strive to master these forms. Shikai could give him new attacks and defenses, while bankai could make him an extremely powerful force. For example, his bankai could combine his ninjutsu skills with the zanpakuto's power in a unique and devastating way.
Tsunade could play a crucial role. She could use her vast knowledge of resources and economics to secure the funds and materials needed for the fleet. Jiraiya, if he were still alive, would bring in his worldly knowledge and connections from his travels. He could help Naruto find rare and valuable materials from far - flung places for building a truly remarkable fleet.
Sasuke could be one to help. Given their history and Sasuke's intelligence, he might contribute some knowledge about energy manipulation which could be useful for the lightsaber's power source.
Iruka could help. He's always been there for Naruto. He might know some old tales about mysterious eggs and give Naruto some useful tips.
Even Kakashi could lend a hand. He might not seem like the gardening type at first, but he has a lot of knowledge. He could help Naruto protect the garden from potential threats, like thieves or pests that might be more dangerous in the ninja world, using his ninja skills.
The Hidden Leaf Village elders could be main antagonists. If Naruto turns dark because he feels betrayed by the village, they would be the ones representing the establishment he is against. Their conservative and sometimes self - serving ways could be the catalyst for Naruto's transformation, and then they would be the ones trying to stop him as he becomes a threat to their power and the village's traditional order.
Well, perhaps Naruto becomes the new apocalypse in a sense that he has been corrupted by some powerful evil force. His friends would then be in a dilemma of having to either stop him or try to save him. His transformation could also lead to a new power hierarchy in the ninja world, with everyone fearing his new, unpredictable abilities.
Sasuke could be one of the people to help. He has a deep understanding of weapons and combat. He might offer some advice on how to make the blade sharper and more effective in battle.