Cannibals-humans that have resorted to eating other humans to survive will kill anyone to turn them into food.
Raiders-humans that have abandoned their morals and will pillage kill and steal for their greed.
Surviors-humans who have kept their morals but are willing to kill if necessary and scavenge for resources.
Hybrids-human zombie hybrids that are immune to zombies and can mind control them and turn people into hybrids by biting them.