In some fanfictions, they explore the idea of Boros and Saitama becoming friends in a different dimension or universe. Boros could be from a parallel universe where he is not a villain, and he meets Saitama in a cross - dimensional event. They then start training together, comparing their powers and techniques. This would be a fun way to explore their characters outside of the typical hero - villain dynamic that was established in the original One Punch Man story.
A cool fanfiction idea could be that Boros' race comes back to seek revenge for his death. Saitama has to then not only deal with the new threat but also the guilt he doesn't really feel (because he doesn't see killing Boros as a big deal) but others project onto him. And Boros' spirit or something of the sort could also be involved, guiding Saitama in a strange way. Maybe Boros' power somehow gets transferred to Saitama and he has to learn to control it, adding a new dimension to his already overpowered self.
One possible storyline could be Boros surviving his encounter with Saitama and then seeking redemption. He realizes the vastness of Saitama's power and decides to train under him. This would be an interesting twist as Boros was initially a villain. Another could be a what - if scenario where Saitama and Boros team up to face an even greater threat that arrives on Earth. It would show their dynamic as they work together, with Saitama's nonchalant attitude and Boros' more serious and battle - hungry nature.
First, understand the characters well. Saitama is bored with his power and just wants a good fight, while Boros is a proud and powerful alien seeking a worthy opponent. Then, come up with a unique plot. Don't just rehash their fight from the original. Maybe create a new world or situation for them. For example, a world where all heroes have lost their powers and Saitama and Boros have to work together to save the day. Also, good dialogue is key. Make it sound like how the characters would actually talk. Saitama's simple and straightforward speech and Boros' more grandiose way of speaking.
One interesting fanfiction storyline could be that Genos discovers a prophecy that Saitama is going to lose his powers. Genos then goes on a mad quest to find a way to prevent this from happening. He visits all kinds of strange places and consults with various powerful beings. Another could be that there is a competition among heroes to see who can train the best new recruit, and Saitama and Genos enter together. They face off against other hero - trainer pairs in various challenges. Also, a story where Genos creates a virtual reality world for Saitama to experience different kinds of battles that he normally wouldn't encounter in the real world, just for Saitama's amusement.
One possible creative storyline could be that Boros somehow manages to survive Saitama's punch and teams up with him. Maybe Boros realizes there are threats in the universe even greater than Saitama and they have to work together. Another storyline could be a time - travel aspect where Boros goes back in time and tries to prevent his own downfall, but in doing so, changes the entire One Punch Man universe. A third creative idea is that Boros' remains are used by a mad scientist in the One Punch Man world to create a new, even more powerful being that has a mix of Boros' powers and some new, unexpected abilities.
A plot where Saitama travels to different dimensions in the One Punch Man universe. He could encounter strange versions of himself or other heroes and villains, leading to humorous and action - packed situations.
There could be a story where they both participate in a hero - training exercise together. At first, Tatsumaki tries to show off her powers and outdo Saitama. But Saitama doesn't really care about competing. As the exercise goes on, they face unexpected challenges that require them to rely on each other's unique abilities. This could be a great opportunity for their relationship to grow, whether it's a friendly bond or a romantic one.
One popular storyline could be them going on a training journey together. Genos, being the eager learner, and Saitama, with his overpowered strength, could teach Genos new techniques in unique ways. Another could be them facing a new, extremely powerful villain that challenges even Saitama, and Genos has to step up in unexpected ways to assist. A third one might be a story where they get transported to a different dimension and have to find their way back while dealing with the strange new world and its inhabitants.
In fanfiction, Lord Boros can also be a character that bridges different story arcs. His presence can attract other powerful beings from across the universe. This can lead to more complex and intertwined storylines. Writers might use him to introduce new concepts like different forms of power or alien politics. His backstory can be further developed, like exploring his rise to power in his home planet and how that influenced his actions on Earth.
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.
One idea could be that Female Boros is a reformed villain. She decides to use her strength to protect the Earth instead of conquering it. She teams up with Saitama and other heroes, and there are comical moments as she tries to understand the simple life of the other heroes. For example, she might be baffled by Genos's constant need for upgrades.
One possible plot could be that in this fanfiction, an alternate dimension where Saitama is a cannibal. Maybe there's a virus that has infected him and turned his moral compass upside down. Writers might explore how the other heroes react to this new, terrifying Saitama. Do they try to cure him? Or do they see him as a threat and try to stop him by force?