Well, aside from Mega Man and Samus, Dr. Wily from Mega Man series and Ridley from Metroid series are also quite popular in these crossovers. Dr. Wily can bring his devious plans and technological know - how to create new threats when combined with the Metroid universe's elements. Ridley, on the other hand, is a fearsome antagonist that can pose a huge challenge to both Mega Man and Samus, adding a lot of action and drama to the fanfiction.
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.
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.
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.
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.
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.
Samus is the central character, but characters from other Nintendo franchises are popular too. Mario could be an unexpected but interesting addition. The contrast between his jolly and simple - looking appearance and Samus' high - tech badassery would be quite something. Additionally, characters like Solid Snake from Metal Gear Solid can be included. His stealth and combat skills could be combined with Samus' exploration and combat abilities in some really cool fanfiction scenarios.
One interesting concept could be the combination of Mega Man's robotic abilities and Samus' exploration skills. For example, Mega Man might use his arm cannon in the more maze - like environments typical of Metroid games. Another concept could be the meeting of their respective villains. Dr. Wily and the Space Pirates could form an alliance, creating a greater threat for the heroes to overcome.
John Koenig is often a popular choice. His leadership skills and complex character make him a great fit for crossovers. He can interact with other strong leaders from different sci - fi shows and create interesting power struggles or alliances.
Monika is often a popular choice. Her strong - willed and somewhat controlling nature can make for interesting crossovers. She can be the one who tries to manipulate the new world or characters she's crossed into. Sayori is also popular. Her bubbly and at times sad nature can add a lot of emotional depth to crossovers, especially in more light - hearted or heart - wrenching scenarios.
Loki is often a popular choice. His ability to deceive and his stealth capabilities can create really interesting plotlines in crossovers. For example, if crossed over with a detective - themed universe, Loki could be the elusive criminal that the detective characters are trying to catch, using his Warframe skills to outwit them.
Ikaris is often a popular choice. His flight and laser - eye powers make him a formidable character in crossovers. He can easily be paired with other flying superheroes or those who can withstand his powerful attacks. Sersi is also popular. Her ability to transmute matter gives her a unique edge, and she can be interestingly paired with characters who have different elemental powers.