Well, start with a concept. Let's say you want to focus on their friendship turning into something more. Write a prologue that sets the mood, like a flashback to when they first met. Then, build the story around their daily lives and how they interact. You can add some action scenes to keep it exciting. Also, research the Kim Possible universe so that your story fits in well. For example, use the existing villains or locations in an interesting way. And most importantly, let your creativity flow and don't be afraid to take risks with the plot.
A fanfic could explore the idea of Joss having a special power that he's been hiding. Kim discovers it by accident, and they have to figure out how to use this new power to stop a powerful villain. Along the way, there are some tender moments between them as they train together and learn more about each other.
You can start by looking on fanfic websites like FanFiction.net or Archive of Our Own. Use the search bar and type in 'Kim Possible x Shego' to see what comes up. There are often filters you can use to sort by popularity or rating as well.
Another theme could be about discovery. Maybe 'kim' discovers a new place full of pine trees and lemon - flavored treats. It could be a journey of self - discovery as well, where the environment of pine and the unique quality of lemon play important roles in the character's growth.
First, think about the relationship between Alix, Kim and Max. Decide if they are friends, rivals or something else. For example, if they are friends, you can start with a scenario where they are planning a fun day out together.
Begin with character development. Outline the personalities of the characters related to gold and silver. Are they heroic, villainous, or something in between? Regarding the lemon, consider it as a plot device. For instance, you could start with a prophecy that mentions a 'gold x silver' union being possible only when the 'lemon' is found. This gives you a mystery to solve right from the start. Also, think about the language and tone you want to use, whether it's light - hearted or more serious.
One popular 'Kim Possible x Shego' fanfic could be 'The Unlikely Bond'. It delves into a complex relationship between the two characters. In this fanfic, they start off as enemies but gradually develop an understanding that is both fascinating and unexpected. The author uses vivid descriptions to bring their interactions to life.
There are also themes of loyalty and trust. In many of these fanfictions, they face challenges that test their loyalty to each other. They have to trust one another in difficult situations. For example, in some stories, Ron has to trust Kim's judgment even when he's not sure about a plan, and vice versa. This adds depth to their relationship and makes for interesting reading.
Maybe there's an ancient artifact that is important in both worlds. It gets stolen and Kim and Naruto both go after it. Along the way, they meet each other's friends. Kim meets the Konoha ninjas like Sakura and Sasuke, and Naruto meets Ron and Rufus. They have to overcome cultural differences as well as the bad guys who want the artifact for their own evil purposes.
One of the main themes is the relationship between good and evil. Kim represents good and Shego represents evil, and the fanfics often explore how their interactions can blur the lines between the two. For example, in some stories, Shego might show a softer side that makes Kim question her own view of villains.
I'm not sure if there is a specific fanfic with this exact combination. You could try searching on major fanfic websites like Archive of Our Own or FanFiction.net.