Obviously, Ash is one of the main characters. He is usually at the center of the story, using his skills as both a Pokemon trainer and a ninja. Pikachu is also a very important character, often using its electric powers in combination with Ash's ninja - like strategies. Sometimes, other trainers like Brock and Misty can also be important characters, providing support or joining in on Ash's ninja - themed adventures.
One interesting Pokemon Ash Ninja fanfiction could be where Ash uses his ninja skills to quickly traverse the Pokemon world and catch rare Pokemon. For example, he might use stealth like a ninja to approach a very shy Pokemon that is difficult to catch. Another could be a story where Ash teams up with a group of ninja - like Pokemon trainers and they go on an epic adventure to save the Pokemon world from a new and powerful threat.
A young and determined trainer named Kai could be a main character. He has a Pikachu that he has trained to use ninja - like moves, such as lightning - fast dodges. Kai is always eager to take on new challenges and prove himself as a great pokemon ninja trainer.
One interesting storyline could be a Pokemon with ninja abilities teaming up with a human trainer from the village to protect a special Pokemon egg. The duo faces various challenges like wild Pokemon attacks and rival ninja trainers who also want the egg for its rumored power.
The Pokemon with unique ninja - inspired abilities are also popular characters. Take Ninja - Froakie, for instance. It has the ability to create water - based ninja tools and can move so quietly in water that it's almost undetectable. Fans love reading about its adventures and how it uses its skills to help the village and its trainer.
Naruto's ability to sense danger, like he does in the ninja world, would help him protect his Pokemon from threats. His Rasengan could be used as a model for a new and powerful Pokemon move. Also, his leadership skills as a ninja could lead him to form a strong Pokemon team and train them in a more disciplined way compared to other trainers.
One idea could be Ash using his ninja skills to quickly catch pokemon. For example, he might use stealth to approach rare pokemon without scaring them away.
One idea could be a group of pokemon ninja trainers who have to protect a rare and powerful pokemon from an evil organization. The trainers could use their ninja skills, like stealth and quick attacks, along with their pokemon's abilities to outwit the villains.
One idea could be that the Pokemon trainers are in the world of the Teenage Mutant Ninja Turtles. They could team up with the turtles to fight against a common enemy, like an evil organization that is trying to take over both the Pokemon world and New York. For example, Team Rocket could be working with some of the villains from the TMNT universe.
Maybe Team Rocket could have a new member who is a ninja. This new member could be Ash's main rival. They would try to steal Ash's pokemon in more sneaky and ninja - like ways. And Ash would have to use his ninja skills to protect his pokemon and defeat this new rival from Team Rocket.