Kakashi is also a favorite in these crossovers. His intelligence and wide range of jutsu, especially the Sharingan, make him interesting. In Marvel, he could be like a mentor figure to some of the younger heroes, similar to how he was in Naruto. In DC, he could be an ally to the Justice League, using his skills to outwit villains. Sakura, with her medical and combat skills, can also be a great addition, perhaps working with the Avengers' medical team in Marvel or with Wonder Woman in DC.
Definitely Naruto and Spider - Man. Naruto's energetic and determined nature combined with Spider - Man's quippy and heroic attitude makes for a great crossover. They could swap powers or team up to fight villains in both universes.
Definitely Bell Cranel. If he is crossed over into the Naruto world, his growth as an adventurer in Danmachi can be compared to the growth of a ninja in Naruto. His determination to become stronger is similar to Naruto's. Also, Ais Wallenstein is popular. Her combat skills and beauty would make for an interesting combination in the Naruto universe, perhaps having epic battles with Naruto's strong female characters like Tsunade.
In Naruto - Scott Pilgrim fanfiction, Rock Lee is a character that many fans like to cross over. His unique fighting style based on pure hard work and determination would be really cool to see in the Scott Pilgrim universe. And from Scott Pilgrim's side, Wallace Wells could be a popular crossover character. His laid - back and sarcastic personality could create some humorous moments when interacting with the Naruto characters.
Probably Naruto himself would be a very popular character to cross over. His energetic and determined personality could bring a lot of action and drive to a crossover story. In Vampire Academy, Rose Hathaway could be another popular choice. She is strong - willed and a skilled fighter. When these two characters meet, there could be a great dynamic of them either competing or teaming up. Another popular character from Naruto that could be used is Sasuke. His brooding and powerful nature would contrast well with the vampires in Vampire Academy.
Harley Quinn and Rey could be a popular crossover. Rey is a strong female character in Star Wars, and Harley Quinn has a very distinct personality. A fanfic could explore how Rey's determination and Harley Quinn's chaos - loving nature would interact, maybe they team up to take on a group of bad guys in a very unorthodox way.
Batman and Wolverine are really popular. Batman's detective skills and gadgets combined with Wolverine's berserker rage and healing factor create a lot of interesting story possibilities. They can both be very dark characters at times, and their team - up or clash in fanfiction always attracts readers.
Fiona is also a top choice. Her relationship with Shreck in the movies gives a lot of material for crossovers. Fanfiction writers might explore how she and Shreck interact in different universes or scenarios, like in a world where they are not in the same fairytale but a different, more modern world.
Superman is also quite popular in 'naruto dc fanfiction'. The idea of the all - powerful Kryptonian interacting with the energetic ninja Naruto has a lot of appeal. His moral code and superpowers create an interesting dynamic when combined with Naruto's world of ninjas and chakra.
Sherlock Holmes is also quite popular. Holmes' deductive skills against Darth Vader's power in the Force would make for an exciting story. Holmes could be trying to figure out Vader's motives and secrets, while Vader might see Holmes as a nuisance or a potential ally depending on the situation.
Ben 10 is a favorite for many. As I said before, the clash between Johnny's human - centered confidence and Ben's alien - powered abilities is exciting. Also, characters like Dexter from Dexter's Laboratory are often used. The scientific genius of Dexter and the not - so - smart Johnny can lead to hilarious and complex stories. Courage the Cowardly Dog is also a great choice as the spooky and strange world Courage lives in can be a great backdrop for Johnny's adventures.