A third storyline could be that Android 18 is sent by the Red Ribbon Army remnants to spy on Master Roshi. But as she spends time with him and his students, she starts to question her loyalties. Roshi, sensing something is off, tries to reach out to her. Eventually, she defects from the Red Ribbon Army and becomes a true defender of Earth, learning martial arts from Roshi along the way.
The fanfic could also revolve around a mission. For example, there's a new threat in the Dragon Ball universe and Android 18 and Master Roshi team up to face it. Along the way, they have to overcome their differences. Android 18's cold - blooded nature (initially) clashes with Roshi's more laid - back and traditional approach, but eventually they find a way to work together effectively.
One interesting interaction could be when Android 18 challenges Master Roshi to a sparring match. Roshi, despite his age, shows some unexpected moves which surprises Android 18. This could lead to her respecting him more.
Perhaps a crossover where the villains from both universes team up. Salem from RWBY and Dio from Jojo could form an alliance. The heroes from both RWBY and Jojo would then have to put aside their differences and work together. This would bring in all sorts of interesting dynamics, like the different fighting styles and power sets having to mesh in order to take on this super - powerful villainous alliance.
One creative storyline could be where the characters from Batim end up in the Underground of Undertale. Maybe Bendy and his crew are mistaken for strange monsters by the Undertale characters at first. They then have to navigate through the various areas of the Underground, facing challenges like the puzzles in the ruins or the battles in Snowdin, all while trying to find a way back to their own world. Another idea is that the Ink Machine from Batim somehow gets connected to the Determination power in Undertale, causing all sorts of wacky and unexpected interactions between the two universes.
One creative storyline could be Optimus Prime finding a lemon - like energy source that has strange powers. This could lead to a whole new adventure where he has to figure out how to use or contain it without it causing chaos. Maybe the lemon - like energy source attracts some new, unknown enemies.
A fanfic could focus on a festival in Liyue. Beidou and Ningguang both participate in different ways. Beidou might bring her rowdy crew to enjoy the festivities, while Ningguang is in charge of the more formal aspects. Their paths cross, and they end up sharing a moment that makes them see each other in a new light. Maybe it's a shared love for a particular Liyuean dish or a cultural performance that bridges the gap between their two worlds.
Maybe in a post - battle scenario, Goku and Android 18 are left alone to recover. They begin to have conversations about their different origins. Goku shares about his Saiyan heritage and training, while Android 18 talks about her creation by Dr. Gero. This exchange could lead to a deeper emotional connection between them.