In such a fanfiction, the story could start with Naruto being summoned to the Code Geass world by some strange magic or technology. He'd be confused at first, but then quickly adapt. The Akatsuki could also be brought into the story as a sort of anti - Britannia group. And the Geass users would be both intrigued and cautious of Naruto's power. There could be epic battles between the ninja and the mecha, and lots of drama as the two different cultures collide.
Lelouch would be really interesting. His complex personality and his ability to manipulate with Geass would make for some great interactions with Naruto. He could try to use Geass on Naruto, but Naruto's strong will might resist it, leading to a power struggle of sorts.
A 'Code Geass' and 'Game of Thrones' fanfiction could be really exciting. It might combine the political intrigue of 'Game of Thrones' with the mind - controlling powers of 'Code Geass'. For example, Lelouch from 'Code Geass' could find himself in the middle of the power struggle in Westeros. He could use his Geass to manipulate the various lords and ladies, adding a whole new level of chaos to the already complex world of 'Game of Thrones'.
In a crossover, the two different power systems would create a really interesting dynamic. The Death Note's power to kill anyone whose name is written in it, and the Geass which can control others' actions. If Light and Lelouch were to cross paths, there would be a battle of wits as they both are highly intelligent characters. Light would be cautious of Lelouch's Geass, and Lelouch would be wary of the Death Note's invisible and deadly power.
A Gintama and Naruto crossover fanfiction could be really interesting. It might start with Naruto characters somehow ending up in the Gintama world. Maybe Naruto and his friends are on a strange mission and get sucked through a portal into Edo. They would be shocked by the wacky and modern - yet still somewhat feudal - nature of the Gintama world. Gintoki could mistake them for some new weirdoes in town. And then there could be all kinds of chaos as Naruto tries to use his jutsu, which might have unexpected effects in the Gintama universe due to its different rules of physics and such.
In this crossover fanfiction, the art styles could also blend in an interesting way. The distinct anime - like look of Naruto characters against the more urban and gritty style of the Boondocks. Story - wise, perhaps there's a common enemy that both Naruto and the Boondocks characters have to face together. It could be someone who wants to disrupt both the ninja world and the Boondocks' community, forcing them to team up and use their combined skills and knowledge to defeat it.
It could be really exciting. Maybe Naruto and his friends find themselves in the Pokemon world. Naruto might try to catch Pokemon using his ninja skills. He could use his shadow clone jutsu to surround a wild Pokemon and then throw a Pokeball. And the Pokemon in this crossover could learn some ninja - like moves. For example, Pikachu could learn how to move as fast as Naruto does.
It could be a combined force of Orochimaru and some of the power - hungry nobles from Code Geass. Orochimaru is always after power and knowledge, and the nobles in Code Geass are often corrupt. Together, they could create a really formidable enemy for the heroes.
One idea could be that Naruto somehow gets the Geass power. He might use it in his battles against the Akatsuki. For example, he could use it to make an Akatsuki member reveal their secrets or to stop them from using their jutsu for a short time.
A Naruto Superman crossover fanfiction could be really exciting. It might start with Naruto somehow ending up in the DC universe. Maybe he'd be confused by all the high - tech stuff in Metropolis at first. Then, he'd meet Superman. They could find that they have a lot in common in terms of being heroes. Naruto's ninja skills like shadow clones and his rasengan could be really interesting to see alongside Superman's super strength and flight. They could team up to fight a common enemy, perhaps an evil ninja from Naruto's world who has also gained some super - powers in the DC universe.
Imagine if there was a tournament that brought the best fighters from both universes together. Naruto, Sasuke, and the others from the Naruto world, and Kai, Jay, and the rest from Ninjago. They start off competing against each other but then realize there is a greater threat lurking. A group of shadowy figures wants to steal the powers of both ninjas and warriors. So, they must put aside their differences and combine their skills to fight this new enemy.