Well, in this crossover, it could be that the Akatsuki from Naruto's world somehow end up in Gotham. They start causing chaos and trying to take over the criminal underworld. Naruto, along with some of Gotham's heroes like Nightwing and Robin, have to join forces to stop them. Naruto's Rasengan and other powerful jutsu would be a huge asset against the Akatsuki's dangerous abilities in the new and unfamiliar territory of Gotham.
One possible plot could be Naruto being transported to Gotham. He might initially be confused by the dark and crime - ridden city. But with his ninja skills, he could start to fight crime in his own unique way, perhaps using his shadow clones to patrol different areas of Gotham simultaneously. His positive and determined attitude could also inspire some of the more down - trodden citizens of Gotham, like the orphans in the city.
A cool plot could involve Batman and Naruto teaming up. Naruto's ability to sense chakra could help them track down villains more easily. For example, the Joker, who might have some strange energy signature that Naruto can detect. And Naruto could learn from Batman's detective skills and strategic thinking, while Batman could be intrigued by Naruto's ninjutsu and his unwavering belief in his friends and comrades.
One possible plot could be Naruto arriving in Gotham and using his ninja skills to combat the crime lords. His ability to move stealthily and use his jutsu might give the criminals a run for their money. He could team up with Batman, and together they'd be an unstoppable force against the likes of the Joker and Penguin.
Perhaps there's a villain in Gotham who has discovered a way to siphon the Flash's speed force. The Flash has to go to Gotham to stop this villain, and in the process, he meets the various characters of Gotham like Gordon and Catwoman. They all have to work together to not only stop the villain from stealing the speed force but also from using it for some evil plan in Gotham.
Maybe there's a meta - human or a super - villain who is causing chaos in both cities. Batman is too occupied with Gotham's internal affairs, so Arrow comes to help. They discover that the villain has a base in an abandoned area between the two cities. They have to combine their resources, like Arrow's high - tech arrows and Batman's detective skills (even if Batman himself isn't directly involved but his influence on Gotham's crime - fighting is there), to take down the bad guy.
Well, perhaps in this fanfiction, the SAO system is corrupted by an Orochimaru - like figure. He wants to use the virtual world to gain power and immortality. Naruto and his friends, along with the SAO players, have to team up. Naruto's positive attitude and never - give - up spirit inspire the SAO players. They all work together to defeat this new threat, with Naruto using his Rasengan in new and creative ways within the SAO world.
A plot could involve the Killzone characters getting access to chakra. Some of the Killzone soldiers might start to learn ninjutsu and this causes chaos in their own military structure. Meanwhile, Naruto has to figure out how to get back to his own world while also dealing with the new threats that this crossover has created. Maybe he teams up with some of the more honorable Killzone soldiers to find a solution.
A plot might involve Naruto being sent to Bayonetta's world. He'd be out of his element, but his determination would shine through. Bayonetta could mistake him for a strange demon at first. However, they soon realize they can help each other. Naruto's chakra could interact in unexpected ways with Bayonetta's magic. Together, they could face off against Bayonetta's foes, like the angels, with Naruto's Rasengan combined with Bayonetta's Witch Time abilities making for some epic battles.
In a Naruto and Spiderman crossover, it could start with Spiderman noticing some strange energy signatures in his city. These turn out to be Naruto's chakra flares. Naruto is there looking for a way back to his own world after being accidentally sent to Earth - 616 (the Marvel Universe). They meet and at first don't understand each other. However, when they see a common enemy, a group of ninjas - like mutants who are causing chaos, they decide to work together. Spiderman uses his agility and web - shooting while Naruto uses his jutsu to defeat the bad guys.
One possible plot could be that Naruto and his team are on a mission in a strange new land that turns out to be the world of Claymore. They encounter Claymores, the half - human, half - yoma warriors. Naruto, with his never - give - up attitude, tries to understand the complex relationship between humans and yoma in this world. He could end up befriending some of the Claymores and together they fight against a powerful common enemy that threatens both their worlds.
One possible plot could be that Naruto, while on a mission, somehow gets transported to the world of Undertale. He teams up with Frisk to stop Flowey from taking over both their worlds. Naruto's ninja skills, like his shadow clones, could be used in creative ways in the battles against the monsters in Undertale.
One possible plot could be that Guts from Berserk is somehow transported to the Naruto universe. He might initially be seen as a threat due to his menacing appearance and his large sword. However, as the story progresses, he could team up with Naruto and his friends to fight against a common enemy, like an Akatsuki member who has acquired some of the dark magic from the Berserk world. Guts' fighting skills and his ability to face the most terrifying foes could inspire Naruto and give him new perspectives on combat.