A more emotional fanfiction could involve Barbara having a special power that Naruto needs to save his village. Naruto has to convince Barbara to use her power, and during this time, they both discover things about themselves and their beliefs. It could be a story of self - discovery and friendship across different fictional worlds.
One idea could be a crossover where Naruto visits Barbara's world and they team up to fight a common enemy. Maybe an evil force that is threatening both their universes. They could learn from each other's fighting styles and abilities.
A more comical fanfiction could be set in a world where all the characters from Naruto and DC are in a high school together. Naruto has a huge crush on Barbara Gordon, and he tries all sorts of wacky ways to get her attention, much to the amusement and annoyance of their classmates.
Maybe Barbara Gordon could be a new kind of Defense Against the Dark Arts teacher at Hogwarts. She'd bring in her own unique combat skills and her ability to analyze situations quickly. In this fanfiction, she could train the students in a more practical and street - smart way of dealing with dark forces, which would be different from the traditional magic - based teachings.
A more complex plot could involve Barbara creating a new technology that could potentially change Gotham for the better. But there are those who want to steal it for evil purposes. Bruce and Barbara then have to protect the technology while also trying to figure out who is behind the threat. This could lead to some intense action scenes and also some tender moments between them as they grow closer through the shared experience.
One plot idea could be Batman and Barbara Gordon teaming up to solve a new and complex mystery in Gotham. Maybe a villain has a new type of weapon that's causing chaos, and they have to use their combined skills to stop it. Another could be Barbara having to face a personal threat that only Batman can help her with, like someone from her past coming back to haunt her. And they could also be involved in a story where they have to protect Gotham from a natural disaster while also dealing with the usual criminal element.
One interesting idea could be the combination of Naruto's ninja skills with mecha technology. For example, Naruto might use his chakra to power up the mecha in unique ways. Another idea could be the new enemies that are created specifically for this mecha - Naruto concept, like robotic shinobi that require different combat strategies compared to normal foes. Also, the design of the mecha Naruto itself can be really cool, perhaps with features inspired by the Nine - Tails.
Maybe Naruto and Barbara Gordon meet in a world where all fictional characters co - exist. They start off as rivals, with Naruto thinking Barbara is too uptight and Barbara thinking Naruto is too reckless. But as they face challenges together, like a threat to this new world they are in, they learn to respect each other's abilities and form a strong friendship.
Another idea is that Aizen somehow ends up in the Naruto universe during the time of the Fourth Great Ninja War. He could try to manipulate both sides for his own gain. But Naruto, with his ability to see the good in people, might try to reason with Aizen and show him a different path. It could be a story of redemption or a great battle if Aizen refuses.
In a 'Naruto Mermaid Fanfiction', the mermaids could be in danger from an evil organization that wants to capture them for their precious scales. Naruto teams up with a mermaid princess to stop this threat and in the process, they learn about each other's worlds.
One idea could be a crossover where Naruto and Pucca end up in the same world due to a strange ninja jutsu gone wrong. Naruto is confused by Pucca's constant chasing of Garu, and he tries to help Garu escape in his own Naruto - style way.
Well, you could write a fanfiction where the Nine - Tails in Naruto has some sort of connection to a powerful entity in the Seraphim universe. This connection could lead to a series of events that require Naruto and the Seraphim characters to work together. Or perhaps a character from Seraphim is reincarnated as a ninja in the Naruto world and has to adapt to the new way of life while still having some of their Seraphim abilities.