One idea could be a crossover where a neglected Naruto is transported to the Code Geass world. He might use his ninja skills in unexpected ways in that new world. Maybe he forms an alliance with Lelouch, and together they fight against the Britannian oppression. Naruto's experience of being neglected could make him more empathetic towards the oppressed in the Code Geass universe.
One idea could be a crossover where Naruto characters end up in the Code Geass world and have to deal with the political intrigue there. For example, Naruto might try to use his talk - no - jutsu on the Britannian royalty.
Another idea is that a character from the Naruto universe is transported to the Code Geass world and gains the Geass power. He then uses his ninja skills along with the Geass to build a harem. He might use his Geass to make female characters fall in love with him, but then has to deal with the moral implications of it, all while trying to survive in this new and dangerous world.
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.
Perhaps Lelouch from Code Geass ends up in the Naruto world. He could use his intelligence and strategic skills to help the shinobi against a common enemy. He might form an alliance with Naruto, and together they come up with plans to take on powerful foes like Akatsuki. Lelouch could also use his Geass to deceive the enemies and gain an upper hand in battles.
For Naruto, his neglected past can be the driving force for his growth in the fanfiction. In the Code Geass world, he could start as a lost soul but gradually learn from the experiences there. For example, seeing how Lelouch manipulates the situation, Naruto might start to think more strategically about his actions. His character development could be about becoming more than just a powerful ninja but also a smart leader.
One idea could be a crossover where the Sharingan in Naruto has some similarities to the Geass in Code Geass. For example, a character from Naruto could gain a Geass - like power that is related to their existing ninja abilities. Maybe Sasuke could get a Geass that allows him to instantly copy any jutsu he sees, just like his Sharingan but with an added power boost.
The combination of powers. In 'naruto code geass fanfiction', seeing how the Sharingan or other ninja abilities interact with the Geass power is really cool. For example, could a Geass user control a ninja under a genjutsu? It creates a whole new dynamic of power play.
One idea could be an OC who is a commoner but has a unique power that gets noticed by Lelouch. For example, the ability to manipulate sound waves which could be used for both stealth and attack. Another could be an OC from a foreign nation who has different moral and cultural values than the Britannians and Japanese, creating interesting conflicts. Or an OC who is a brilliant scientist working on a secret project that could change the balance of power in the Code Geass world.
One idea could be Naruto's godlike powers being misinterpreted by the villagers, leading to new forms of neglect. For example, they might fear him instead of accepting him, causing him to be isolated in a different way.
Well, in this type of fanfiction, it might show Naruto being neglected by his so - called friends. As a result, he decides to leave and seek power elsewhere. This could lead to him exploring different ninja techniques from other regions. He could also form new alliances with rogue ninjas who have similar experiences of being outcasts.