Well, Cassandra's back story is full of hardships. In the Z Nation universe, the zombie outbreak changed everything. She was on her own for a long time. She might have witnessed some really horrible things, like people turning into zombies right in front of her. This would have been terrifying but also made her more determined to live. When she met the group, she was initially hesitant but soon realized that being part of a group could increase her chances of survival. Her past experiences as a lone survivor influenced how she interacted with the group members, sometimes being a bit guarded but also very loyal once she trusted someone.
Cassandra's back story involves her struggle to survive in the Z Nation setting. She was alone for a while, facing zombies and trying to find a safe place. She had to adapt quickly to the new and dangerous world. She must have learned how to avoid zombies and find resources on her own, which made her a valuable addition to the group later.
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.
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.