One idea could be a story where Shantae and Risky are forced to team up against a common enemy that threatens both their worlds. They start off distrustful of each other but as they face challenges together, they begin to understand each other better.
To write a good Shantae x Risky fanfiction, focus on the relationship between the two characters. You can start with their initial animosity and gradually build towards a more complex relationship. Also, don't be afraid to add some unique elements to the story. Maybe introduce a new magical item or a strange new location that they both have to deal with. Another important aspect is the dialogue. Make it sound like the characters, with Shantae's positive and determined tone and Risky's more sly and self - interested tone.
One idea could be a Shantae crossover with Metroid. Shantae could explore the alien worlds in the Metroid universe, using her dance - based powers to navigate the complex terrains. Another idea is a crossover with Sonic the Hedgehog. Imagine Shantae racing through the Green Hill Zone, her hair flowing behind her as she tries to keep up with Sonic. Or a crossover with Zelda, where Shantae teams up with Link to fight Ganon, bringing her unique abilities to the fight against the forces of evil in Hyrule.
One plot idea could be that Shantae discovers she is pregnant during a time of peace in her land. She then has to balance her usual duties of protecting the area with preparing for motherhood. Maybe she could start training a young apprentice to take over some of her tasks while she is on maternity leave.
Maybe X - 23 is on the run from some anti - mutant forces and finds herself in Gotham. Batman initially suspects her but then realizes she's being hunted unjustly and decides to help her. They then have to fight off the hunters while also dealing with Gotham's regular villains.
A plot where 707 and MC get trapped in a virtual world that is a distorted version of their own reality. They need to find a way to escape by solving puzzles and relying on each other's unique skills. For example, 707's hacking abilities could be crucial in finding glitches to break free.
A more complex plot could be that there is a misunderstanding between Stitchpunk 1 and Stitchpunk 2. Stitchpunk 1 thinks Stitchpunk 2 has betrayed the group. As they try to resolve this issue, they uncover a conspiracy within their community that they must work together to stop. This would involve a lot of character development and exploration of their relationship.
One idea could be that the OC is a healer who stumbles upon Frankenstein's monster in the woods. The OC decides to help the monster, despite the danger, and they form an unlikely bond. This could lead to a story of redemption for the monster and a journey of self - discovery for the OC.
A plot could revolve around Sesshomaru being intrigued by Naruto's determination. Sesshomaru decides to train Naruto in some of his own combat techniques, which Naruto adapts to his own fighting style. In return, Naruto shows Sesshomaru the value of friendship and loyalty within a village. This could lead to Sesshomaru having a change of heart about his own solitary ways. Also, they could team up to face a common foe from Sesshomaru's world that has somehow entered the Naruto universe.
Maybe the OC is a scientist who has developed a device that can temporarily steal The Flash's speed. At first, the OC uses it for personal gain, but then realizes the chaos it's causing in the city. They then team up with The Flash to take down other villains who are after the device. Or, the OC could be a meta - human with the ability to see the future in flashes. The Flash initially doesn't trust the OC, but as they start to have the same visions, they have to work together to prevent a major disaster from happening.
A plot could involve the reader being a healer of sorts. Flowey, being curious, approaches the reader. As they interact, the reader starts to show Flowey kindness that he's not used to. This kindness begins to thaw his cold, calculating nature. They could then go on adventures together in the Underground, with Flowey slowly becoming more protective of the reader. Also, the reader could introduce Flowey to new concepts like friendship and self - sacrifice, which would be a huge change for him.