Perhaps Naruto discovers that the baseball player has a secret connection to the ninja world. Maybe the player has a special power that he uses in baseball, which is actually a form of chakra control. Naruto then tries to learn this new way of using chakra from the player.
One possible plotline could be Naruto getting inspired by his favorite baseball player to form his own team in the ninja world. He might use the skills he's learned from ninja training, like teamwork and strategy, in baseball. For example, using shadow clones to cover different positions on the field.
His favorite could also be Jackie Robinson. Since Naruto has always fought against discrimination in his own world, he might admire Jackie Robinson for breaking the color barrier in baseball. Naruto would see Jackie as a hero, not just in baseball but also as someone who overcame great odds and prejudice.
In this fanfiction, the plot could be that Naruto's kid is kidnapped by an old enemy of Naruto's who wants to train the kid to be against the village. The kid has to use his wits and the little ninja training he has received so far to escape. Meanwhile, Naruto is on a desperate search for his child. This would create a lot of tension and also show how much Naruto has grown as a father compared to his own orphaned past.
Perhaps Naruto becomes a ramen chef to bring joy to the people of Konoha. He could start by working in Ichiraku Ramen and then decides to open his own shop. His friends support him, and he invents ramen that gives people different kinds of chakra boosts, which attracts all kinds of ninjas from different villages.
One possible plotline could be a young hockey player from Edward Hospital who is injured and has to struggle through rehab. His fans, especially one die - hard fan, could be a major part of his motivation to get back on the ice. The fanfiction could focus on their relationship, how the fan's support helps the player overcome his physical and mental hurdles.
Maybe in the fanfiction, Percy's player side shows up when he has to navigate the complex social hierarchies of the demigod world. He could be seen charming different groups of demigods, from the children of Athena with his quick - witted remarks to the children of Aphrodite with his newfound 'player' charisma. This could lead to all sorts of adventures and conflicts as he tries to maintain his relationships while also keeping up his player image.
One possible plotline could be that Naruto somehow ends up in the world where Natsuhi is from. Maybe he's on a mission and gets sent through a strange portal. He then uses his ninja skills to help Natsuhi deal with some local threats in her village. His positive attitude might also start to influence the more reserved Natsuhi, leading to a friendship or more.
Maybe Naruto discovers baseball in the Hidden Leaf Village and decides to form a team with his ninja friends. They could use their ninja skills in unique ways on the baseball field, like using shadow clones to confuse the opposing team.
Perhaps Naruto is assigned to protect a civilian who has accidentally witnessed a secret ninja experiment. The bad guys want to silence the civilian. Naruto starts as just a bodyguard but soon realizes that the experiment is part of a much larger and more dangerous scheme that could endanger the whole village. He then becomes more than just a bodyguard, but also an investigator to stop the scheme.
One interesting Naruto player fanfiction could be about a new character who is a super - skilled ninja gamer in the Naruto universe. They might use their knowledge of the game mechanics to outwit real - life opponents in battles.
Another plotline might be exploring Naruto's past more deeply. Maybe there are secrets about his parents that were never fully revealed in the original. In the fanfiction, he could discover something new about his father's time as Hokage or his mother's Uzumaki heritage that changes his perspective on his own powers and responsibilities.