Perhaps the fanfiction explores an alternate universe where Naruto is raised by an 'evil genius' figure. This could lead to him having a very different set of values and skills. He might be more ruthless in achieving his goals and use his intelligence to create new and powerful jutsus that are more self - serving rather than for the good of the village initially.
One interesting concept could be the idea of a character in the Naruto universe who is an evil genius and how they manipulate the existing power structures. For example, they might use their intelligence to turn different ninja clans against each other for their own gain.
One interesting idea could be a unique take on Naruto's power. Maybe in this fanfiction, Naruto discovers a new form of chakra that's related to his 'dark genius' side. For example, it could be a chakra that allows him to manipulate shadows in a way no one else can.
Well, a cool fanfiction concept could be that some of the Resident Evil villains get transported to the Naruto universe. For example, Albert Wesker shows up and tries to take over the ninja villages using his superhuman abilities and intelligence. Or perhaps the Resident Evil bio - weapons are let loose in the Naruto world and the shinobi have to figure out how to deal with these new threats that are completely different from their usual enemies like other ninja clans or rogue ninjas.
Well, one idea could be the fusion of Naruto's unique jutsu with the DxD universe's magic system. For example, Naruto might use his shadow clone jutsu in a new way within the DxD battles. Another aspect could be the character interactions. Evil Naruto might form unexpected alliances or rivalries with the DxD characters. Maybe he would see some of the devils as kindred spirits in his new evil state.
In 'evil god naruto fanfiction', there might be a shift in the relationships. Naruto, being influenced by the evil god, could turn against his friends. This would create a lot of tension and drama. His former allies would have to decide whether to try and save him or stop him by any means necessary, which is a classic and engaging plot device.
One idea could be a child genius Naruto who quickly masters advanced jutsu way before his peers. For example, he might figure out how to combine multiple elemental jutsu at a young age, creating a completely new and powerful attack.
Perhaps Naruto gets influenced by a dark and ancient power. He starts to see the ninja world as corrupt and decides to reshape it according to his own dark vision. He could form his own army of outcasts and fight against the established ninja villages.
One idea could be that Evil Naruto tries to manipulate Ino's mind - related abilities for his own dark purposes. Maybe he wants to use her to spy on the other ninja in the village without her realizing it.
One idea could be an evil Naruto using his shadow clones in new and devious ways in the RWBY universe. For example, he might send clones to disrupt the huntsmen training, causing chaos. Another could be Naruto teaming up with some of the villains in RWBY due to his newfound 'evil' nature, and together they plan to take over key locations in the RWBY world.
One idea could be that the evil Naruto tries to manipulate Kushina's power for his own dark purposes. Maybe he wants to take over the Hidden Leaf Village using her influence as his mother. Another could be that he forms an alliance with the village's enemies, and Kushina has to make the tough choice between stopping her son or trying to save him from his evil ways.