Another idea for a fanfiction involving 10K in Z Nation is a time - travel scenario. What if 10K somehow got sent back in time to before the zombie outbreak? He could use his knowledge of the future to try and prevent the apocalypse, or at least change some things to make survival easier for everyone.
One idea could be a crossover where Naruto characters end up in the Z Nation world. For example, Naruto with his shadow clone jutsu could be really useful against the zombies. He could send out clones to distract the zombies while the group tries to find a safe place.
Well, 'The Lone Survivor in Z Nation' is a popular one too. It tells the story of a single person who manages to outwit the zombies and other dangerous groups all by themselves. The way the author describes the survival tactics is really engaging.
I'm not sure exactly who the main characters are as I haven't read it thoroughly. But they are likely to be a diverse group of survivors with different skills and personalities, such as a strong fighter, a smart scientist or a resourceful scavenger.
It's about a post - apocalyptic world filled with zombies. The story likely follows a group of survivors as they try to navigate this new, dangerous world, facing not only zombies but also other challenges like finding food, shelter and dealing with other groups of survivors.
Survival is a very common theme. Since it's set in the Z Nation world, characters like 10k are constantly fighting for their lives against zombies. Another theme is friendship, like the bond between 10k and his comrades. They rely on each other to get through tough situations.