Characters are the various mercenaries that players can use when playing the game. New players get to choose between three basic characters: SWAT, OMOH and SAS. Other characters can be obtained via various ways, either permanently (Item Shop, Black Market, Coupons or Tickets) or temporary (Item Shop, Zombie Mode rewards, etc).
- The Slug is the default mutant in the North American version of the game.
- Some characters have a variety of skills that may varies from a character to another in other versions.
- N-22 is the only non-human character that can be own permanently (excluding default mutants).
- Main article: Character Renders