Another aspect to consider is the storylines. A fanfic could have a plot where the Akatsuki are after some valuable in - game item in GTA V. And the main characters from GTA V have to team up with Naruto and his friends to protect it. This would bring together the goals and conflicts of both universes, creating a really interesting and unique fanfic.
One way to combine the GTA V and Naruto universes in a fanfic could be through a crossover of characters. For example, Naruto characters could be transported into the GTA V world. They might use their ninja skills in the modern, crime - filled setting of Los Santos. Naruto could use his shadow clones to perform heists in a very unique way. Sasuke could use his Sharingan to outwit the criminals and corrupt cops in the city.
Well, one way could be that the chakra in Naruto's world is similar to the energy that Pokemon use. So, a Pokemon might be able to absorb chakra to become stronger. Or a ninja could learn to use Pokemon energy to enhance their jutsu. For example, a fire - style jutsu could be powered up by the energy of a fire - type Pokemon.
Another aspect could be the fusion of their worlds' elements. In Mortal Kombat, there are dark and hellish realms, while Naruto has its own unique elemental chakra system. A fanfiction could explore what would happen if the dark magic from Mortal Kombat's realms seeped into the Naruto universe and affected the chakra. Maybe it could create new types of jutsu or even corrupt some of the ninja. It would be a great source of conflict and adventure in the story.
Maybe a character from the Naruto universe, like Naruto himself, could be summoned to Wakanda due to some powerful magic or technology gone wrong. He would bring his ninja skills and values, and his presence could disrupt the power balance in Wakanda. This would lead to various interesting scenarios, such as Naruto learning about Wakandan culture and the Wakandans learning about ninja techniques.
One way to combine the superhero and Harry Potter universes in fanfic is through a magical accident. For example, a spell gone wrong could transport Harry Potter and his friends to a world full of superheroes. There, they might learn new powers or use their magic in unexpected ways to help the superheroes fight villains.
Well, in fanfiction, you could have a plot where the chakra system from Naruto is somehow related to the chi in Kung Fu Panda. Maybe a character discovers that the two are different manifestations of the same energy source. This could lead to some really interesting interactions. For instance, Po could teach Naruto how to better understand and use his inner energy in a more 'Kung Fu' way, and Naruto could show Po some ninja tricks based on chakra control.
Well, a possible combination could be that the godlike powers of Naruto are somehow related to the strange anomalies in Gravity Falls. The energy that gives Naruto his power could be the same type of energy that causes the strange happenings in Gravity Falls. So, a fanfiction could explore how Naruto's power affects the balance of Gravity Falls and vice versa. He could use his chakra to control the weird forces at work in Gravity Falls.
One way could be through a magical portal. Maybe some Fairy Tail magic creates a portal that sucks Naruto and his ninja friends into the Fairy Tail world. Then they have to team up with the Fairy Tail mages to face a common enemy.
Well, one way is to have the magic from Harry Potter interact with the physical threats of the Tremors universe. For instance, the protective spells around Hogwarts could be modified to keep out the Tremors creatures. Or the Portkeys could be used to transport characters to areas affected by Tremors.
Well, it could be that the magic from Harry Potter's world and Android 18's advanced technology somehow interact. Maybe the spells in Harry Potter are used to enhance or modify Android 18's abilities. For example, a spell could be cast on her to make her energy blasts more powerful or her speed even faster.
One way to combine them could be through a crossover device. For example, a powerful Pokemon like Mewtwo could accidentally open a portal to the Avengers' universe. Then, the Avengers might mistake the Pokemon for some kind of new alien threat. They would try to contain it, but soon realize that the Pokemon has no malicious intent. Meanwhile, the Pokemon trainer who follows Mewtwo through the portal has to team up with the Avengers to find a way back home and also deal with any villains in the Avengers' world that might try to use the Pokemon for their own gain.