Maybe Naruto and Tenten get transported to a parallel universe where their roles are reversed. Tenten is now the one with the Nine - Tails sealed inside her, and Naruto is a weapons expert. They have to adapt to these new identities while also trying to find a way back to their own world. In the process, they gain a new perspective on each other's abilities and develop a deeper friendship.
One possible plot could be that Tenten discovers a hidden jutsu in an ancient scroll that was once used by Naruto's clan. This jutsu has the power to create portals to different dimensions. Naruto, being curious and always up for an adventure, teams up with Tenten to explore these new dimensions. Along the way, they face various challenges and enemies, and also learn more about each other's skills and pasts.
It could be Orochimaru. He might be interested in Tenten's unique weapon skills and Naruto's power of the Nine - Tails. He could try to capture them to conduct experiments on how to combine their powers for his own gain. He might create some sort of hybrid - clone with Tenten's weapon - using abilities and Naruto's chakra.
The plot might involve Naruto and Tenten being forced into the arranged marriage by the village elders for political reasons. At first, they resist it. Tenten is annoyed because she always saw Naruto as a bit of a goofball. However, when they are sent on a mission together, they have to rely on each other. Naruto's determination and Tenten's skills complement each other. As time passes, they begin to respect and then care for each other, and the arranged marriage starts to seem like a good idea.
Maybe in this fanfiction, the gamer aspect brings in a system of quests to the Naruto world. Naruto has to complete various quests around the Hidden Leaf Village, like helping villagers with their daily problems or finding rare items. These quests could reward him with new jutsu or power - ups. It would be like he's living in a real - life RPG, which would add a whole new layer of adventure to the Naruto universe.
One possible plot could be that Naruto and his friends from the Naruto universe are suddenly transported to the Destiny universe. They could be mistaken for new Guardians at the Tower. Naruto's chakra abilities might be misinterpreted as a new form of Light power. They then have to team up with Destiny's Guardians to fight against a common enemy that threatens both universes, like a powerful Darkness entity that has somehow found a way to cross over from Naruto's world where the Akatsuki's actions have weakened the barriers between worlds.
One interesting plot could be that Ichigo and Naruto are brought together in a strange alternate dimension. In this dimension, they have to team up to fight a new common enemy that has powers combining the Hollow and the Nine - Tails. They start off not understanding each other's abilities but gradually learn and combine their powers in unique ways to defeat the enemy.
A plot might involve Batman investigating strange energy readings in Gotham that turn out to be related to Naruto's world. Naruto arrives in Gotham following a villain from his own world who is after some powerful technology in Batman's possession. Naruto and Batman start off at odds but as they learn more about each other's strengths and motives, they form an alliance. Naruto teaches Batman about chakra and the ninja way, while Batman shows Naruto how to use stealth and technology in a more urban environment.
One possible plot could be that Naruto, through some strange space - time rift, ends up in Kaguya's era. He could then team up with her against a common enemy that threatens both their worlds. Naruto's unique jutsu and his never - give - up attitude might inspire Kaguya, and together they could create new and powerful techniques.
One possible plot could be Naruto and his friends being summoned to the world of For Honor. Naruto, with his ninja skills, could team up with the samurai and Vikings in For Honor. He might teach them some of his unique jutsu, like the Shadow Clone Jutsu to create diversions in battles. And in return, he could learn the combat styles of the For Honor warriors. They could then face a common enemy that threatens both the ninja world and the For Honor world.
One interesting plot could be that Naruto is somehow transported to the DC universe. He teams up with Superman. Naruto's chakra and his ninja skills like shadow clones could be used in unique ways to fight villains. For example, the shadow clones could be used to distract enemies while Superman delivers a powerful blow. It would be a clash of two very different power systems and cultures.
One interesting plot could be that Naruto and his friends are transported to the Pokemon world. Naruto, with his determination and ninja skills, decides to become a Pokemon trainer. He might choose a Pikachu as his first Pokemon because of its spunk, similar to his own. Along the way, he discovers that some of the Pokemon have chakra-like abilities and he tries to use his ninja knowledge to train them in new ways. His friends also each choose their own Pokemon and they compete in Pokemon battles while also trying to find a way back to their own world.