Roman(16): Roman's entire family was killed by the nuclear blast. Aside from his brother but he doesn't know that. He immediately made a camp and group with his friends Patton and Remy. Roman has taken charge and is basically the leader. Roman did eventually find his brother, but he was already a zombie. He couldn't kill him, so the just keep him tied up in a cage for now.

Patton(16): Patton was separated from his parents, but found his brother who'd moved out a few years ago.

Janus(21): Half of Janus' face was destroyed by a smaller bomb. He then began searching for his younger brother. Along the way he found Virgil hiding in a bunker.

Virgil(19): His parents were both very prepared for the apocalypse and at the slightest sign the locked him in the bunker. Virgil stayed locked in the bunker for a month until Janus found him while raiding his house. He then joined forces with Janus searching for Patton.

Remy(18): Nothing really interesting other than the fact the he was bitten by a zombie in the leg and had to cut it of before he turned.

Logan(23): He was a scientist that separates himself from society so much that he went kind of insane. Imediatly when the zombies apeared he grabbed zombies and humans alike to experiment of to try and find a cure. He was only able to figure out how to stabilized the zombies and give them free will against their animalistic needs.

Picani(19): Picani figured out what Logan was doing and was able to stop him from hurting any more people. He basically took Logan as a prisoner and stole all of the zombie stabilizing medicine that he made. No they're trying to reach a giant settlement called the capitol, so they can save all the zombies.

Ships:
Logan x Remy
Janus x Virgil
Everyone else stays single