Ninja Zombies appear in a cloud of smoke, whereby they will attack the player using Kung Fu moves. Their attacks are incredibly deadly, up to the point of nearly killing the player without Tuff 'Nuff. They will first appear at scene 21. They spawn in various areas of the map, usually where zombies spawn. The ninjas can disappear and reappear in a different location nearby if they take damage but not enough to kill them almost instantly or if the players attempt to sprint away from them.
An important thing to note is that the ninjas will be able to attack immediately after reappearing from smoke and thus can quickly down a player, especially if they are running. This can lead to a vicious cycle where the player attempts to run away from the ninjas, then the ninjas "teleport" towards the player and hit the player immediately. Thus, should a player encounter one, the best course of action is to prioritise them over other zombies as they do a lot of damage in short amount of time.
Ninja Zombies look identical to one another, wearing a mask similar to the that of the Rat King's in shape. They also wear a Kung Fu outfit with a Black Belt.