Well, in 'Naruto is Saitama' fanfictions, the idea of teamwork is interesting. Imagine Naruto and Saitama teaming up. Naruto could use his strategic thinking and Saitama his brute force to take on enemies. Also, the idea of Saitama teaching Naruto how to be more efficient in battle without overcomplicating things, like Naruto's tendency to rely on complex jutsus, can be a fresh take. And the reverse, Naruto showing Saitama the value of having friends and comrades in battle, which is something Saitama doesn't really have in his own world, could add depth to the story.
One interesting idea is the power exchange. For instance, Naruto could learn Saitama's training regime and gain his incredible strength, while Saitama might learn some ninja techniques. This would create a really unique dynamic in the story.
Another great crossover would be with One Piece. Saitama could be on a journey with the Straw Hat Pirates. His super strength would come in handy during battles against the various pirates and marines they face. And his comical personality would contrast well with the wacky and diverse personalities of the Straw Hat crew.
One plot idea could be that Tsunade discovers a rare medical condition that only Naruto has the potential to overcome due to his unique chakra. So, she devotes all her time to researching and treating him, while Naruto tries to keep his spirits up during the process. This would show their bond and determination.
Another interesting concept is a crossover where the villains from the OPM world are a threat to Saitama's own world. Saitama then has to team up with the OPM heroes to fight back. This could lead to some really cool fight scenes and interactions between different characters.
One idea could be that Saitama somehow ends up in the RWBY world. He could be mistaken for a very powerful Huntsman. Maybe he decides to help out at Beacon Academy, but his non -chalant attitude towards the Grimm would be really amusing. For example, he might just one - punch a huge Grimm and then be like 'Is that it?'
One interesting 'naruto saitama fanfiction' could be about Naruto and Saitama teaming up to fight a powerful villain from both their universes. They would combine Naruto's ninja skills and Saitama's incredible strength.
A plot where Saitama travels to different dimensions in the One Punch Man universe. He could encounter strange versions of himself or other heroes and villains, leading to humorous and action - packed situations.
One idea could be a male Naruto character getting transported to the Claymore world and having to learn their combat styles. He could use his Naruto abilities in unique ways to help the Claymore warriors. Another is that a male Claymore, inspired by Naruto's values, tries to change the way things work in the Claymore world.
Maybe a plot where Naruto's Sound Release is related to an ancient and forgotten clan. He has to learn about his heritage to fully master this power. He could go on a journey to find the remnants of this clan and uncover secrets about his newfound ability along the way. This would involve a lot of exploration and interaction with different characters from the Naruto universe.
One idea could be that Naruto discovers his Boil Release ability during a particularly tough battle. He uses it to create steam - based attacks that can blind his enemies or create a smokescreen for strategic maneuvers.
One plot idea could be that Female Genos is in a battle and gets severely damaged. Saitama helps her repair and during this process, they start to understand each other on a deeper level. They might share their pasts, like Saitama talking about his mundane pre - hero life and Genos about her reasons for becoming a cyborg. This could lead to a budding friendship or something more romantic over time.