Naruto and Mega Man themselves are often the most popular crossover characters. Since they are the main protagonists of their respective series, fans love to see how they interact. Another popular one could be Rockman (Mega Man) interacting with Sasuke. The contrast between Rockman's more robotic and logical nature and Sasuke's brooding and power - hungry personality can create some interesting dynamics.
Zero is an obvious choice. He is a well - known character from the Mega Man X series and his skills and relationship with X can add depth to a crossover story. For example, in a crossover with the Devil May Cry series, Zero's swordsmanship could be compared and contrasted with Dante's.
Definitely Mega Man and Samus are the most popular. They are the main protagonists of their respective series, so it's natural that they take center stage in the crossovers. Their contrasting yet complementary abilities make for great storylines.
One of the most popular pairings is Mega Man and Roll. It's a classic pairing within the Mega Man universe itself, and in crossovers, it can add an emotional depth to the story. For example, if they are in a dangerous situation in a crossover world, their relationship can be further explored as they protect each other.
It could be Naruto in his strongest form, like Six Paths Sage Mode. He has incredible power, speed, and the ability to use a wide variety of jutsu. He could potentially overpower Mega Man's weapons with his raw chakra power. However, Mega Man has his own advantages like his adaptability with different weapons and his experience in fighting robotic enemies. But if we consider overall power and the scale of destruction Naruto can cause in his most powerful state, he might be the most powerful.
X and Zero are definitely the most popular. X is the main protagonist and his journey of growth and discovery makes for great fan fiction. Zero, with his cool appearance and combat skills, is also a fan favorite. Another popular character is Sigma. He's the main villain, and exploring his motives and backstory can add depth to a fan fic.
Dr. Wily is a very prominent character in Mega Man Robot Master fanfiction. His devious plans and constant attempts to take over the world make him a great antagonist. Many fanfictions explore his backstory, his motives, and his relationship with the Robot Masters he creates. Some fanfictions also make him more sympathetic, giving him reasons for his actions that go beyond just pure evil.
Mega Man himself is obviously a very popular choice. He's the main character, after all. Also, Proto Man often makes an appearance. His mysterious nature and complex relationship with Mega Man add depth to the story. Dr. Wily is another popular character. He can be the main villain or sometimes even an anti - hero in some fanfictions.
Definitely Naruto and Superman. They are both iconic characters in their respective universes. Their different power sets make for an interesting comparison. Another popular crossover is between Sasuke and Batman. They both have a dark and brooding side. And of course, Sakura and Wonder Woman. The contrast between Sakura's ninja skills and Wonder Woman's superhuman abilities is appealing.
Naruto himself is often a popular choice for crossover. His high - energy and powerful ninja skills make him a great addition to the Skylanders world. Sasuke is also quite popular. His brooding nature and powerful Sharingan abilities can create some really interesting storylines when combined with Skylanders. Sakura, with her medical ninjutsu and combat skills, can also be a great crossover character.
In some cases, characters like Luffy from One Piece are also quite popular in 'naruto vs crossover fanfiction'. Luffy's rubbery body and carefree attitude can be a great contrast to Naruto's more serious ninja side. When they cross paths in fanfiction, their different goals and ways of approaching challenges can lead to some really fun and unexpected storylines.