One Punch Man is a really popular anime. Fubuki, as a character in it, has a lot of potential for fanfics. In a fanfic about them, it could explore their relationship in new ways. Maybe it could show Fubuki trying to recruit Saitama into her group in a more detailed and different way than in the original story. It could also develop her character further by showing her reactions to Saitama's overpowering strength in unique scenarios.
One possible plot could be that Fubuki, being frustrated with her lack of progress in terms of power compared to Saitama, decides to train with him. This would lead to a series of comical and at the same time, character - building moments. Saitama would probably give her some really simple but effective training advice that she initially scoffs at but later realizes is genius.
The fanfiction about Fubuki and Tatsumaki in One Punch Man is alluring because it gives a chance to expand on their characters. Fubuki, with her ambition to be a great hero, can be explored further. Maybe in a fanfic, she overcomes her insecurities related to her sister Tatsumaki's much stronger powers.
Many One Punch Man fanfics with Fubuki and Tatsumaki focus on their interactions with other characters too. They could be paired with Saitama in some comical or action - packed situations. Like, Fubuki trying to recruit Saitama into her group while Tatsumaki is constantly skeptical of his abilities.
As of the current storyline in the One Punch Man web comic, Fubuki is still alive. The plot doesn't involve her death.
A possible plot is that the OC is a former enemy of Fubuki who has seen the error of their ways. They try to make amends by helping Fubuki in her quest to become stronger and more respected in the hero community. This could involve training sessions where the OC shares some unorthodox fighting techniques that complement Fubuki's psychic powers. The OC could also have connections to some powerful and mysterious figures in the One Punch Man universe, which could open up new storylines for Fubuki.
The OC can be introduced as a new recruit in Fubuki's group. For example, they could be a young and inexperienced hero who is in awe of Fubuki's powers and leadership. They start by following Fubuki's orders and gradually prove themselves useful in battles.
In One Punch Man fanfiction, Mosquito Girl can be a really interesting character to explore. Some fanfictions might focus on her backstory, like how she became the way she is. Maybe she had a difficult past that led to her transformation. In these stories, authors can give her more depth than what we see in the original manga or anime.
In One Punch Man fanfiction, Lord Boros can be portrayed in various ways. Some fanfictions might show him as having a more sympathetic side. Maybe he had reasons for his actions that were not fully explored in the official story. He could also be used as a tool to introduce new threats or challenges for Saitama or other heroes. His strength level is something that can be exaggerated or modified in fanfiction to create more interesting battles and scenarios.
I'm quite sure there exists a 'Naruto is One Punch Man' fanfic. The world of fanfiction is vast and full of all kinds of creative crossovers. Writers might be intrigued by the idea of bringing Naruto's ninja skills and the unique world of One Punch Man together. For example, how would Naruto react to the overpowered villains in One Punch Man's world? And how would Saitama view Naruto's determination to protect his village? These are the kind of things that could be explored in such a fanfic.
Tatsumaki in fanfiction can be portrayed in different ways. One aspect could be her origin story exploration. Writers may delve deeper into her past, perhaps how she came to be so powerful. This could involve her training, or any events that shaped her personality. Also, her interactions with villains in fanfiction can be interesting. She might face new and more challenging foes that test her limits in ways the original manga may not have.