The Immune (The Walking Dead/Carl Grimes)
Starting in the middle of season 1 TWD
Casey of course was tragic. Along with the broken world where a disease has taken over. She doesn't know how it happened, when it happened, or why it happened, but's she immune. When she crosses paths with Rick's group the same questions goes around, why is a twelve year old girl immune? Is she the cure? Will she save the world? Or end it?
Slowly as time goes on she discovers parts of herself she didn't know were even there. Her tears are acid, her blood can attract walkers, her spit can kill walkers, and she is of course immune to the bite. Carl, being the only boy she has seen in what seems like forever, she grows feelings for the blue eyed boy. As for him, he's fascinated by the girl who is impossibly perfect. Little did they know they would be the end of each other.
As they go on protecting Casey, will they ever find the cure? Or will she watch everyone she loves die?