One idea could be a tournament where characters from different villages and generations compete. For example, Naruto's son could face off against Sasuke's daughter. Another could be a team - based arena fight where the teams have to strategize and use unique jutsus to win. Maybe a fight in an ancient, forgotten arena filled with dangerous traps that the fighters have to avoid while battling each other.
One idea could be a tournament where Naruto characters use their fist - fighting skills. For example, Naruto could face off against Sasuke in a no - jutsu, just pure fist - fighting battle. It would be intense as they both have their own unique fighting styles. Naruto's more energetic and improvisational style against Sasuke's calculated and precise strikes.
One idea could be to create a story where Naruto discovers a new and powerful fighting style from an ancient scroll. Another could be a fanfiction about a tournament among all the ninja in the Naruto universe, with unique rules and unexpected alliances. Or perhaps a story where Naruto has to fight an enemy who can copy his every move and he has to find a way to outwit them.
One idea could be that Naruto characters are transported to the Street Fighter universe and have to learn the fighting styles there. For example, Naruto might be intrigued by Ryu's Hadoken and try to incorporate it into his own Rasengan. Another could be a tournament where both Naruto and Street Fighter characters compete. Sakura could face off against Chun - Li, with Sakura using her medical ninjutsu in unique ways during the fight.
One idea could be a crossover tournament where Naruto characters like Naruto, Sasuke, and Sakura enter the Street Fighter universe to compete. They could learn new fighting styles from the Street Fighter characters and form unique friendships or rivalries.
Another plot line could be that Naruto discovers a new form of chakra that is related to being a fighter. This new power source could attract the attention of powerful and malicious forces. He then has to fight to protect this new power and also figure out how to master it without it consuming him.
One idea could be Poison joining the Street Fighter tournament to prove herself. She might face off against some of the well - known Street Fighter characters like Ryu or Chun - Li. Another plot could involve Poison teaming up with a Street Fighter character, say Ken, to take on a common enemy that threatens both their worlds.
A third plot idea is a crossover with the 'Final Fantasy' universe. Ryu could be transported to a world filled with magic and monsters. He would have to team up with the Final Fantasy characters to fight against a common enemy, perhaps using his Hadouken in combination with magic spells.
One idea could be Percy having to face off against a new type of mythical creature in the arena that no one has ever seen before. It would be a test of his skills and quick thinking.
Perhaps there could be a story where the dark forces in Mortal Kombat are trying to corrupt the pure - hearted characters in Street Fighter. Akuma might be a target for this corruption. The Mortal Kombat villains could offer him more power in exchange for his loyalty. The other Street Fighter characters would then have to try and save Akuma from this dark influence, and they might seek help from some of the more morally ambiguous Mortal Kombat characters.
A plot idea could be that Naruto discovers a new, ancient form of chakra that has been lost for centuries. He then has to train to master this chakra while also dealing with the political implications within the Hidden Leaf Village. Some elders might be against him exploring this new power for fear of the unknown, but Naruto, being Naruto, is determined to master it for the good of the village.