Obviously, Naruto and Merlin are the main characters. Naruto is the one being trained, and Merlin is the trainer.
Well, perhaps Naruto, with his natural talent, is taken under Merlin's wing. Merlin could teach Naruto some really powerful magic or unique combat strategies. Maybe Naruto becomes even more powerful than in the original series and uses his new skills to protect his village in ways no one expected.
The main character is Naruto without a doubt. His journey of becoming godlike is the focus. The toads are also main characters. Big - name toads such as Fukasaku and Shima could be in it. They are likely to be the ones teaching Naruto. Their guidance and the bond between Naruto and the toads are important aspects of the story, making them all main characters in this fanfic.
Obviously, Naruto and Deadpool would be the main characters. Naruto is the one being trained and evolving into a 'godlike' state. Deadpool is the trainer who brings his own set of skills and personality to the story.
The main character is Naruto without a doubt. He is the one on the path to becoming god - like through the Kyuubi's training. The Kyuubi is another key character. It has a vast amount of knowledge and power, and it imparts this to Naruto. Additionally, characters like Jiraiya could be important. Since Jiraiya was Naruto's mentor in the original story, he might play a role in this fanfiction too, perhaps guiding Naruto in a different way in combination with the Kyuubi's training. And then there are Naruto's friends. Sakura could be there to support Naruto or be in awe of his new powers. Sasuke might be an interesting character as he could be Naruto's rival, either trying to catch up to his power or oppose him if their paths diverge due to Naruto's god - like transformation.
It could be the other Hidden Villages. Since Naruto is becoming so powerful under Danzo's training, they might see him as a threat and try to stop him. Maybe they would send their best ninjas to take him down.
Obviously, Naruto and Obi - Wan are the main characters. Naruto, the ninja from the Hidden Leaf Village, and Obi - Wan, the Jedi from the Star Wars universe. They are the focus as Obi - Wan is training Naruto.
The main antagonists could also be a group of rogue ninjas who have made a pact with some meta - humans from the Flash's world. They could be after Naruto because they want to use his connection to Barry Allen to gain access to the Speed Force. These antagonists would be a combination of the stealth and trickery of ninjas and the super - powers of meta - humans. They could create a lot of chaos in both the Naruto and Flash worlds, forcing Naruto to use all of his newly acquired skills and powers to stop them.
Well, in this fanfic, it's likely about Naruto becoming extremely powerful, like godlike. Since he's trained by the toads, he probably gains unique abilities and skills. Maybe he masters new jutsus that are far more powerful than the regular ones. It could also involve his adventures and how he uses these newfound powers to face his enemies.
In this fanfic, perhaps Naruto's godlike powers would be a result of Danzo's unorthodox training methods. Danzo could push Naruto to his limits, making him a force to be reckoned with. Naruto might also have to deal with the distrust of his friends at first, as they are suspicious of his association with Danzo.
In this fanfic, perhaps Deadpool's training makes Naruto question his own beliefs and values. Naruto has always been about friendship and protecting the village, but Deadpool's chaotic nature might make him see things from a different perspective. As Naruto becomes more 'godlike', he has to balance his newfound power with his original ideals, and this internal struggle could be a major part of the story.