One great 'Kim Possible x Shego' fanfiction is 'The Unlikely Alliance'. It explores a scenario where Kim and Shego have to team up against a new common enemy. The story does a great job of delving into their complex relationship, showing how their initial animosity gradually gives way to a grudging respect.
A common theme is the idea of redemption. Shego, being a villain, often has a journey towards redemption which is intertwined with her relationship with Kim. For example, Kim might be the catalyst for Shego to change her ways.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions, and you can easily search for Kim x Shego ones using the search bar.
One great Kim x Shego fanfiction could be 'The Unlikely Alliance'. In this story, they are forced to work together against a common enemy, which leads to a gradual understanding and a unique bond forming between them.
Shego and Kim as unlikely allies could mean that they are brought together by fate. Perhaps a powerful artifact is about to be misused, and they are the only two who know how to stop it. Their initial meetings would be full of tension, but as they start to understand each other's motives, they form a tentative bond.
Another factor is the rich universe of Kim Possible. There are so many possibilities for stories within this world. When you combine Kim and Shego, you get a unique dynamic. Fans are drawn to seeing how they would interact in different situations that may not have been explored in the original show. For example, what if they were stranded on an island together? The fanfiction can take these ideas and run with them.
There's also 'Shego's Change of Heart'. In this story, Shego starts to question her motives and her relationship with Kim. It delves deep into her character and how her feelings towards Kim might be evolving in a more positive direction.
One common theme is the exploration of their relationship, whether it's adversarial or evolving into something more friendly. Another theme is Shego's own self - discovery, as she often has a complex backstory in fanfiction. Also, the power dynamic between them, with Kim being the hero and Shego the villain, is frequently explored.
The setting can also be important. Placing them in a different world or time period, like a steampunk version of their world or in an ancient civilization, can add a whole new layer of interest to the story. This allows for creative interpretations of their characters and how they would interact in such settings.
In a Shego - kidnaps - Kim - Possible fanfiction, the plot could be filled with high - stakes action. Shego might have some devious plan behind the kidnapping, perhaps related to a powerful artifact Kim was about to retrieve. Kim, being the resourceful hero, would surely find ways to outwit Shego even in captivity. This could lead to an exciting cat - and - mouse game within the story.