Maybe a group of dark - type Pokémon that have banded together and are trying to overthrow Arceus. They view Naruto as an easy target at first, but quickly realize he is a formidable opponent with his ninja skills and new Pokémon - related powers. They would constantly try to undermine Naruto and his efforts to protect the Pokémon world.
In the Naruto world, it could be Orochimaru. He might be interested in Naruto's newfound Pokémon - related powers and try to capture him to experiment on him. Orochimaru is always after power, and Naruto's unique abilities could be very appealing to him.
Well, the main antagonists could be a group of rogue ninja who are hired by a powerful nation to take down Naruto. Since he is unkillable, they would have to use more underhanded tactics like trying to isolate him from his friends and allies. Or perhaps there is a dark force that is awakened by Naruto's unkillable state, thinking that he is a threat to the balance of the ninja world. This dark force could then become the main antagonist, trying to destroy Naruto at all costs.
There might be. Fanfiction writers love to create crossovers and unique scenarios. Since Naruto and Arceus are from different fictional realms (Naruto from the ninja world and Arceus from the Pokémon world), a story with Naruto as the father of Arceus would be quite an out - of - the - box concept. It could involve some complex world - building and character development to make it work.
Arceus itself might be a character in a way. Maybe it appears in Naruto's dreams or visions, guiding him on how to use his powers. Also, other characters from the Naruto universe like Sakura, who might be in awe of Naruto's new abilities, and might also play a role in helping him understand and control his powers better.
Some fanfictions might feature rogue ninja as antagonists. These rogue ninja are after the bounty on Naruto's head or they are trying to steal Jiraiya's knowledge. They attack Naruto and Jiraiya during their travels, making it difficult for them to reach their destination.
Often, it could be the Akatsuki. They are always after the power of the tailed beasts, and with Naruto being protected by the Kyuubi, they would be major antagonists. They might come up with new and devious plans to try and get to the Kyuubi within Naruto.
It could be some rogue ninjas who are against Naruto's new peaceful policies as Hokage. They might see Hinata as a weakness to be exploited to get to Naruto.
The Akatsuki members might also be antagonists. Since they're after the tailed beasts, Naruto with his additional power of lightning control would be a prime target. They might send their most powerful members like Pain or Itachi to deal with him.
It could be a group of rogue ninjas who also ended up on the island. They might be after some valuable resource on the island and see Naruto and Tsunade as obstacles.
The Sound Ninjas could be great antagonists. They could use their own unique parkour - like skills to try and stop Naruto. They might be chasing him through the forest, and Naruto has to use his parkour skills to outmaneuver them.