You can try fanfiction websites like Archive of Our Own. It has a large collection of fanfics, and there's a good chance you'll find 'kim x porchay fanfic' there.
One great 'kim x porchay fanfic' is 'The Unseen Bond'. It beautifully explores the relationship between Kim and Porchay, with a lot of emotional depth.
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.
Hard to say. It could be that Manga Kim and Triple X are characters from different stories and have no obvious relationship. Or they might be part of a complex plot that hasn't been fully revealed yet.
A common theme could be friendship. Given their connection in the original source material, many fanfics might explore how their friendship grows and deepens over time. They might face challenges together and support each other through difficult situations.
One common theme is adventure. They might go on quests together in the Minecraft - inspired world, facing challenges and growing closer through their experiences.
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.
Adventure is also a theme in some kim x frank fanfiction. They embark on various adventures together, which not only tests their friendship but also allows them to explore new places and face different challenges, like in a story where they go on a treasure hunt and have to rely on each other's skills to succeed.