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 plotline is Tatsumaki trying to get Saitama to take things more seriously in battle. Since Saitama is so overpowered, Tatsumaki, with her strong sense of pride in her own abilities, might feel frustrated by Saitama's nonchalant attitude. Another plotline could be a team - up against a powerful new villain. The contrast between Saitama's simple yet extreme strength and Tatsumaki's more complex psychic powers would make for an interesting dynamic in combat.
One idea could be Saitama and Tatsumaki teaming up to face a new, extremely powerful villain that even Saitama has trouble with at first. Maybe this villain has the ability to manipulate reality in a way that nullifies Saitama's strength for a short time, and Tatsumaki has to use her psychic powers to protect Saitama while he figures out a way to overcome this new obstacle.
One possible plot idea could be that Tatsumaki gets injured during a battle and Saitama has to take care of her. This would force them to interact closely and start to understand each other better. Another idea is that they are both chosen for a special mission together. Along the way, they face various challenges that require their combined powers. Tatsumaki might initially be dismissive of Saitama, but as they work together, she realizes his true strength and value. This could lead to the development of a deeper relationship between them.
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.
Saitama is a very powerful hero in the One Punch Man universe. He can defeat any opponent with just one punch. He has a simple appearance and a somewhat laid - back personality.
One popular theme is Tatsumaki's relationships. It could be her relationship with other heroes like Saitama or Genos. Another common theme is her growth as a character, both in terms of her powers and her personality. Some fanfictions also explore her backstory in more depth.
Some writers develop their relationship through shared experiences. Let's say they both get transported to a strange dimension. In this new and dangerous place, they have to depend on each other. Saitama might use his strength to protect Tatsumaki from physical threats, while Tatsumaki uses her psychic powers to navigate and solve puzzles. Through these shared experiences, a bond forms. They start to respect each other's abilities and personalities more, which could lead to a deeper connection, be it friendship or love.
When writing their character dynamics, consider their powers. Saitama's physical strength is limitless, while Tatsumaki's psychic powers are vast. This can lead to interesting situations. For instance, Tatsumaki might try to use her powers to move Saitama as a joke, but it doesn't work. This creates a humorous moment and also shows their relationship. Also, show how Saitama's lack of fear affects Tatsumaki. She might be used to people being intimidated by her, but Saitama is different. This can lead to her respecting him more and changing her attitude towards him. Their character dynamics should be a mix of comedy, action, and a bit of romance if the fanfic is going in that direction.
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 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.