One unique feature is the combination of different universes. For example, in a Naruto - Bleach crossover, you get to see Naruto's chakra system interact with Bleach's reiatsu. Another is the new character developments. Reincarnation often gives Naruto or other characters new backstories and abilities. Also, it can bring fresh plotlines like in a Naruto - One Piece crossover where Naruto might have to deal with the concept of Devil Fruits in a new way.
Well, 'Naruto's Reincarnation in the Attack on Titan World' is a fascinating 'naruto crossover recarnation fanfiction'. In this story, Naruto has to face the Titans with his ninja abilities, and the contrast between the two worlds makes for an exciting read. Then there's 'Naruto Reincarnated in the My Hero Academia World'. It's interesting to see how Naruto's powers would be perceived in a world full of quirks. Another good one is 'Naruto's Reincarnation in the Code Geass World' where Naruto's reincarnation disrupts the political and power - play of the Code Geass universe.
The theme of destiny also frequently appears. Many fanfictions suggest that Christina's reincarnation is not a random event but part of a greater destiny, perhaps related to saving the world from some great evil in the Vampire Diaries universe. There's also the theme of power. As she adjusts to her new life, Christina may gain new powers or have to deal with the power struggles among the different supernatural species.
A Naruto and Albedo fanfiction crossover could be really interesting. It could start with Naruto somehow ending up in the world where Albedo exists. Maybe he gets there through a strange jutsu gone wrong. Naruto's positive and determined personality could contrast with Albedo's more complex nature. They could team up to face a common enemy, with Naruto's combat skills and Albedo's knowledge of her world combining to create a unique dynamic.
In a Naruto - Skullgirls fanfiction, Sakura could team up with one of the Skullgirls. Sakura's medical ninjutsu combined with the brute force of a Skullgirl character would make a formidable duo. They could go on adventures together, facing off against common enemies. It would also be fun to see how the two different art styles blend in the fanfiction, like Naruto's more traditional anime look with the unique, somewhat gothic style of Skullgirls.
One possible scenario in a Naruto - Kaneki fanfiction could be that Kaneki somehow ends up in the Naruto world. Maybe through a strange portal or some sort of jutsu gone wrong. He might initially struggle to adapt to the different environment and the presence of chakra. But his own unique kagune abilities could be seen as a strange new form of power in the Naruto universe.
A Naruto and Albedo fanfiction crossover could be really interesting. They are from different fictional universes, Naruto from the ninja - filled world of Hidden Leaf Village and Albedo from the more fantastical world of Genshin Impact. In this fanfiction, perhaps they could meet through some sort of interdimensional rift. Naruto's skills as a ninja, like his shadow clone jutsu, could be a source of amazement for Albedo, who is more into alchemy and magic in his own world. They could team up to face a common enemy that somehow threatens both of their worlds, learning from each other's unique abilities along the way.
One possible fanfiction could be about Naruto and Kuroka teaming up on a mission. Maybe they are in a world where different anime universes collide. Naruto's skills in combat and his never - give - up attitude could be combined with Kuroka's unique powers to defeat a common enemy.
One idea could be that Greninja, being a ninja - like Pokémon, somehow gets transported to the Naruto universe. It could team up with Naruto and use its water - based attacks in combination with Naruto's Rasengan. Maybe Greninja's ability to blend into the shadows could be used in stealth missions in the Hidden Leaf Village.
Well, a really cool concept could be a villain that threatens both the Naruto and DBZ universes. So, characters from both sides have to team up to defeat this powerful foe. Imagine Vegeta and Sasuke having to work together, despite their initial differences. Also, there could be a story where the Dragon Balls are somehow transported to the Naruto world, and Naruto and his friends try to figure out what they are and how to use them.