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Characters are the various mercenaries that players can use when playing the game (excluding ZM bosses). 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 North American version replaced the Dread with the Hulk mutant as the default one.
- Some characters have a variety of skills that may vary from a character to another in other versions.
- N-22 is the only non-human character that can be owned permanently (excluding default mutants).
- Even if the new models of the three basic characters were released with the 2.0 update, the old models are can still be purchased, seen, and used in-game.