Genos is also quite popular in these fanfictions. He might be written as being in awe of King's reputation at first, and then later realizing there's more to King than meets the eye. Genos could be involved in plots where he tries to learn from King, or even protect King when his true abilities (or lack thereof) are discovered by the wrong people.
Obviously, King himself is a very popular character in 'One Punch Man King' fanfiction. He is often the center of the story, whether it's about exploring his mysterious powers or his relationships with other heroes. Another popular character is Saitama. Since they are both part of the hero association, there are many fanfictions that involve their interactions, like Saitama being curious about King's supposed feats of strength.
Saitama is always popular in One Punch Man Si Fanfiction. His overpowered yet simple - minded nature makes him a fascinating character to write about. Genos also has a large following as his loyalty to Saitama and his own journey to become stronger are interesting themes. King is another popular character, especially when it comes to exploring his 'fake' reputation and his real abilities (or lack thereof).
Well, characters like Tatsumaki from One Punch Man are quite popular in these fanfictions. Her powerful and somewhat haughty personality can create interesting interactions with BNHA characters. On the BNHA side, Todoroki is also a popular choice. His dual - Quirk ability and his complex backstory can be combined in interesting ways with One Punch Man concepts. And Saitama's presence can either help him grow or create some really challenging situations for him.
Saitama is definitely one of the most popular. His insane strength and laid - back attitude make him a great character for crossovers. Superman is also very popular as he is one of the most iconic DC characters. When paired with Saitama, it creates a lot of interesting scenarios. Batman is another popular one. His detective skills and strategic mind contrast with Saitama's straightforward power.
Naruto and Saitama are often paired in fanfiction. Their contrasting personalities, with Naruto's exuberance and Saitama's non -chalance, make for an interesting dynamic. Another popular pair is Sasuke and Genos. The brooding nature of Sasuke and the serious, robotic Genos can create some intense storylines.
One popular OC is often a female character with extraordinary speed. She can move so fast that she seems to teleport in short distances. Fans like her because she adds a different dynamic to the battles, especially when paired with Saitama or Genos. She can quickly assess the situation and assist in various ways.
Genos and Rukia could also be a popular pairing. Genos' robotic nature and his loyalty to Saitama could be an interesting contrast to Rukia's cool and collected Soul Reaper self. They might have some unique interactions, like Genos being curious about Rukia's zanpakuto and spiritual powers.
The main character is King. But other characters from the One Punch Man universe may also make appearances, like Saitama who is often associated with King due to the misunderstandings regarding King's 'heroic deeds' which are actually Saitama's most of the time.
Obviously, King would be one of the main characters. Since it's named after him, he would likely be at the center of the story.
Genos is also quite popular. His loyalty to Saitama and his own journey to become stronger provide rich material for fanfiction writers. They can expand on his character development, his relationships with other heroes, and his attempts to understand Saitama's power.
Often, original characters who are strong but also have a complex backstory are popular. For example, a character who was once a villain but turned to the side of the heroes for a very personal reason. Their struggle between their past and their new identity as a hero can be really engaging.