The survivors are the main playable characters of World War Z.
Currently, there is a total of 20 unique characters in the game to play as.
The survivors are a group of four different people that reflect the location that they hail from. Circumstances that have arisen from the ongoing zombie war have brought each of the four survivors together to work as a group in order to achieve the same goals.
Every survivor is given their own unique appearances, voice lines, personality, and backstory to distinguish each other from one another. Although each and every survivor comes in various heights, shapes, and sizes, as well as different experiences and backgrounds, they all play the same gameplay-wise. Since they do not possess any means of altering gameplay on their own, the character you chose to play as ultimately comes down to preference.
In Co-op Campaign, there are five episodes with four survivors each to choose from. When playing Multiplayer or Horde Mode, players are free to choose any survivor from any location to play as, so long as their teammates have not chosen that survivor already.