Sasuke is also a strong candidate. Despite their past differences, Sasuke would not let Naruto be held captive by Kumo. He has the power and skills to take on Kumo's ninja if necessary. His determination would drive him to rescue Naruto.
It could be the entire Konoha 11. They are Naruto's friends and comrades. They would work together as a team, each using their unique abilities. For example, Shikamaru could come up with a brilliant strategy, and Choji could provide the brute strength when needed.
He would likely interact with Killer Bee. Since Killer Bee is a well - known and powerful ninja in Kumo, Naruto might be drawn to him for training or just to exchange ninja knowledge.
Luke Skywalker could be a likely ally. Luke is known for his open - mindedness and his ability to see the good in people. He would probably be intrigued by Naruto's unique powers and his strong sense of justice. They could team up to fight against the Sith or any other common enemies.
I think Gaara could be an ally. Gaara has control over sand and is very powerful. He and Naruto have a mutual respect for each other. Additionally, Jiraiya. Jiraiya was Naruto's mentor and has a vast knowledge of different jutsu and combat techniques that could be used against Omega Shenron.
Iruka sensei might also be involved. He has always been like a father figure to Naruto. He could give Naruto the confidence he needs and maybe even help him plan the location for the proposal, perhaps a place that has sentimental value for both Naruto and Hinata related to Naruto's early days at the academy.
One possibility is that Naruto's friends would immediately launch a rescue mission. They would likely gather intel about Kumo's motives and whereabouts. For example, Sasuke might use his Sharingan to track any clues left behind. Sakura would prepare medical supplies in case of injuries during the rescue.
Another possible antagonist could be a rogue ninja from Hailbel's past. This ninja could have a vendetta against her family or something she did in the past. When he discovers that Hailbel is with Naruto, he decides to take them both on. He might have some unique and dangerous techniques that Naruto and Hailbel have to figure out how to counter.
Ninjas, of course! They would come to relax after a long day of training or missions. Also, fans of the ninja world from within the story would be there. Maybe even some of the village leaders would stop by to show support for the local business.
Obviously Naruto would be one of the main characters since it's in the title. And since it's about saving Wave as a Kumo fanfiction, there might be some Kumo ninjas involved too. Maybe Killer Bee or some other well - known Kumo shinobi.
Naruto would probably use his friendly and outgoing nature to adapt. He'd start by getting to know the people around him, like his new family and the local ninjas. He might also be interested in Kumo's unique jutsu and training methods, which would help him fit in. And of course, he'd keep his goal of promoting peace between Konoha and Kumo in mind, which would give him the motivation to overcome any difficulties in adapting.
Sasuke would be a likely ally. They have a long - standing relationship and have fought side by side before. Sasuke's Sharingan and his own unique abilities would be a great asset against the Ten - Tails.