Maybe Lucifer has some connection to the tailed beasts in the Naruto world. For instance, he could be interested in their power and tries to control them. This would bring the shinobi together to protect the beasts. Sasuke might initially be intrigued by Lucifer's power and consider joining him, but Naruto's influence makes him see the danger, and they fight side by side against Lucifer.
One possible plot could be that Lucifer, bored with the underworld, decides to visit the Naruto universe. He could take on the form of a powerful ninja and start causing chaos, which draws the attention of Naruto and his friends. Naruto, seeing the evil in Lucifer's actions, tries to convince him to change his ways, leading to a series of battles and philosophical debates.
In a Naruto Lucifer crossover fanfiction, Lucifer could be a fallen angel who lost his powers and ends up in the Naruto universe. He discovers that by using chakra, he can regain some of his strength. He starts training in ninja arts, but his dark nature causes problems. Naruto, with his ability to see the good in people, tries to befriend Lucifer and show him a different path, while also having to deal with the threats Lucifer unknowingly brings to the village.
Perhaps in this fanfiction, Supergirl is accidentally sent to Lucifer's world. Lucifer, intrigued by her powers and pure heart, decides to help her get back to her own world. Along the way, they face various threats together and learn from each other's moral compasses.
One idea could be that Crowley from 'Good Omens' and Lucifer from 'Lucifer' meet in a neutral realm. They start off as rivals, each thinking they are the most devilish. But as they interact, they realize they have more in common than they thought. Maybe they team up to play a prank on some self - righteous angels, which goes awry in hilarious ways.
Perhaps in this fanfiction, Naruto's connection to Lucifer is a secret kept by a few powerful beings. As he grows stronger, he starts to show signs of Lucifer - like abilities such as the ability to manipulate shadows in a more sinister way. This causes his friends to be both curious and a bit afraid of him. Naruto then has to figure out how to control these new powers and keep his relationships intact.
Well, it could be about Naruto having some sort of connection to Lucifer. Maybe he inherits some of Lucifer's powers and has to deal with the consequences. For example, he might struggle with the dark nature of those powers while still trying to protect his village.
In a Naruto x Lucifer crossover fanfiction, the plot could start with a rift opening between the Naruto universe and Lucifer's world. Naruto, always eager to explore and help, enters the new world. There, he meets Lucifer. Lucifer is initially skeptical of Naruto but soon realizes his strength. They could then form an alliance. Naruto could teach Lucifer about friendship and loyalty, while Lucifer could introduce Naruto to the darker aspects of power and how to navigate them. Their combined forces would be a force to be reckoned with against any threats to either world.
Well, one way it could work is by exploring Naruto's sense of justice in the context of Lucifer's world. Naruto is all about friendship and protecting the village, while Lucifer has his own complex view on good and evil. Maybe Naruto could be transported to Lucifer's realm and try to bring his values there, causing a clash or an interesting fusion of ideologies.
One possible plot could be that the Thundercats are transported to the Naruto universe. They might be mistaken for powerful ninjas at first. Lion - O could end up learning some ninja techniques and share his sword - fighting skills with the ninjas. Cheetara could use her speed in the same way as some of the fast - moving ninjas in Naruto. And they could all team up to fight a common enemy, like a powerful rogue ninja who has some dark magic similar to the villains in the Thundercats' world.
One possible plot could be that Riddick somehow gets transported to the Naruto universe. He could initially be seen as a threat, but then he teams up with Naruto and the others to fight a common enemy, like a new powerful Akatsuki member who has powers similar to some of the creatures in Riddick's world. Riddick's combat skills and his ability to see in the dark could give the Naruto gang an edge in battles.
One possible plot could be that Naruto has to go on a special mission with Kurenai. They might be sent to a hidden village where they discover a new type of jutsu that is being misused. Kurenai's genjutsu skills and Naruto's rasengan could be combined in unique ways to fight against the villains using this jutsu.
Well, perhaps in this crossover, Sephiroth is a rogue ninja from a far - off land that has powers similar to his in the Final Fantasy world. He starts causing destruction in the Hidden Leaf Village. Naruto, being the hero, decides to face him. Along the way, they discover that their powers have some strange similarities. For example, Sephiroth's sword techniques could be compared to some of the advanced sword - using ninja in the Naruto world. And they might end up having to team up against a greater evil that emerges because of Sephiroth's arrival.