Zero is the central figure in Megaman Zero Original Story. He is joined by some other important characters like Ciel. Ciel is often an ally to Zero, providing support and information in their fight against the common enemies.
The plot of Megaman Zero Original Story mainly focuses on Zero, a powerful reploid. He wakes up in a post - apocalyptic world and has to face various challenges and enemies. He battles against the forces that threaten the remaining pockets of civilization.
Zero is obviously one of the most popular. He's the main character in the original series, so he often takes center stage in fanfictions. Ciel is also quite popular as she is an important figure in the Megaman Zero world and has a complex relationship with Zero.
In a 'below zero original story', the main characters might be scientists studying the effects of extremely cold temperatures. They could be trying to understand some strange phenomenon that occurs only below zero degrees. For example, they might be researching a new form of ice or a life form that thrives in such cold. They would face various challenges like equipment failure in the cold, and conflicts within the team due to the harsh conditions.
Axl can be a great addition. He has his own unique abilities and a bit of a wilder personality compared to X and Zero, which can add some interesting dynamics. Also, Sigma is often included as a major antagonist. His complex motives and powerful presence make for great story material. Another good character is Alia. She can provide support to X and Zero from the base, and her intelligence can be used in various ways in the fanfiction, like helping to analyze enemy weaknesses.
Zero himself could be the main character in a sense. Imagine he somehow gets transported to the Naruto universe. He'd be a fish out of water at first, but his combat skills and sense of justice would make him a force to be reckoned with. He could start to learn about chakra and ninjutsu, and use his knowledge from his own world to help or even lead the Naruto characters in battles against new threats.
I'm not entirely sure without having watched it closely, but they are likely to be drug traffickers, law enforcement officers, and maybe some people caught in the middle like informants or family members of those in the drug trade.
Obviously, Megaman Starforce and Megaman Rock would be the main characters. They are the ones the title focuses on. Maybe their respective sidekicks or friends could also play important roles, like Geo's friends in Starforce and Rock's allies like Roll.
In the 'megaman battle network full story', MegaMan.EXE is a central character. He is a NetNavi with unique abilities and is tasked with protecting the network. Lan, his operator, is also very important as he controls MegaMan.EXE in battles and helps him make decisions. Additionally, there are characters like Chaud and his NetNavi ProtoMan.EXE. Chaud is often a rival to Lan, but they also team up at times. And then there are other supporting characters like Lan's family members and other NetNavis that exist in the digital world, all of which contribute to the overall story in different ways.
There are several main characters in the 'generation zero story'. They are a group of young survivors who each have their own skills and personalities. For example, there's one who is really good at scavenging for useful items, another is an excellent shot with a gun.
There are several main characters, like Sigma and Phi.