Perhaps there could be a fanfiction where a lemon - loving alien visits Earth and befriends Genos and Saitama. The alien brings with it a powerful lemon - based energy source that attracts villains. Genos and Saitama then have to protect the alien and the energy source from the bad guys. In the process, they discover new ways to use their powers in combination with the lemon - based energy, leading to some really cool fight scenes and a deeper bond between them.
One idea could be a story where Genos accidentally discovers Saitama's secret love for lemon-flavored things and decides to surprise him with a lemon - themed day. He could make lemon pies, lemonade, and decorate their place with lemon - scented items. Another plot could involve a lemon - related challenge where they both have to complete tasks involving lemons to gain some sort of power - up or reward. Maybe a mysterious lemon - themed villain appears and they have to defeat it using their combined strength and the unique properties of lemons.
One plot idea could be that Female Genos is in a battle and gets severely damaged. Saitama helps her repair and during this process, they start to understand each other on a deeper level. They might share their pasts, like Saitama talking about his mundane pre - hero life and Genos about her reasons for becoming a cyborg. This could lead to a budding friendship or something more romantic over time.
The lemon aspect could be incorporated as a shared interest. For example, they could go on lemon - picking outings together. Saitama might show Genos his favorite lemon trees, and Genos could learn how to pick the ripest lemons. This simple activity can strengthen their bond.
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.
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.
A fanfiction plot could involve Tatsumaki and Saitama getting trapped in an alternate dimension. They have to rely on each other to find a way out. Along the way, they learn more about each other's pasts and what made them become heroes. This would be a great opportunity for character development and exploring their relationship in a new setting.
One idea could be that Saitama and Tatsumaki are forced to team up for a special mission. During this mission, Tatsumaki starts to see Saitama's hidden strength and unique charm, which gradually changes her initial dismissive attitude towards him.
One idea could be to have Genos from One Punch Man cross over with an immortal character from another series. Maybe they could team up to fight a powerful, otherworldly threat that neither could handle alone. The contrast between Genos' robotic nature and the immortal's long - lived experience would create interesting dynamics.
Another great crossover would be with One Piece. Saitama could be on a journey with the Straw Hat Pirates. His super strength would come in handy during battles against the various pirates and marines they face. And his comical personality would contrast well with the wacky and diverse personalities of the Straw Hat crew.
One common theme is the exploration of an unlikely relationship. Since Saitama is very powerful and Genos is his disciple, in a female Genos x Saitama scenario, it often involves how they navigate their feelings while maintaining their roles in the hero - disciple dynamic.
One idea could be that Evil Saitama is actually a clone created by a mad scientist. The clone has all of Saitama's power but none of his morality. He starts to create chaos in the hero world, challenging heroes and causing destruction. Another plot could be that Evil Saitama is an alternate version from a parallel universe where he turned bad due to a tragic event in his past. He then travels to the main One Punch Man universe to seek revenge on the heroes there.