There might be a fanfiction where Clover has to protect King Julien from a new threat in the jungle. As she does so, they start to see each other in a different light, not just as king and protector. For example, in a situation where a powerful and mysterious creature arrives, and Clover's bravery in the face of it makes King Julien fall for her even more.
You can try looking on fanfiction websites like Archive of Our Own. There are often many different fanfictions about various pairings, including King Julien and Clover. Just use the search function and type in their names.
As I don't know the story, I can't say for sure what the main characters are. But I assume Karl would be one of the main characters, and perhaps there are some special ducks as well.
Friendship is a very common theme. Many fanfics explore how Karl and Sapnap's friendship is strong and endearing. They might go through challenges together but always come out stronger.
In the 'last man on earth Karl story', Karl is the central figure. He could be an ordinary person who was thrust into this extraordinary situation of being the last human. Maybe he has certain skills or qualities that help him survive, or perhaps he has to learn quickly how to endure in this new, lonely world.
One popular 'karl x sapnap fanfic' is 'Adventures Together'. It's a story that focuses on their friendship evolving into something more special during a journey in a magical world. The writer does a great job of portraying their characters and the bond between them.
I'm not sure specifically what the 'Sophia Julien Secret Story' is as the name is rather ambiguous. It could be a personal story about someone named Sophia Julien, perhaps a family secret, a love story, or an adventure she had. Without more context, it's difficult to say for sure.
I'm not sure specifically which 'julien fanny secret story' you are referring to. There could be many stories related to people named Julien and Fanny. It could be a personal family secret, a story within a specific community, or something else entirely.