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Carlos
Carlos leads the Rippers, a cult that worships the Freakers and carves RIP into its members' foreheads. You hear about him long before you see him, as his followers hunt for two Mongrels bikers. He is the main villain of the game's first half.
Matthew Garret
Colonel Matthew Garret leads the Deschutes County Militia from its base on Wizard Island in Crater Lake. His army aims to wipe out the Freakers and store humanity's knowledge in a cave he calls the Ark. Deacon works under him in the Law And Disorder storyline.
Skizzo
Skizzo is one of the heads of security at Iron Mike's Lost Lake camp. He objects to Deacon and Boozer coming back from the moment they arrive. You work with him on runs for explosives in the Keep Your Friends Close storyline.