New Enemy: The Zealot

I think it would be cool to see a sect of religious fanatics who let themselves succumb to radiation and mutation. They would be always aggressive and would carry melee weapons and on rare occasion a firearm. They would be attacked by zombies, too, since the zombies view them as a human just like our characters. They would have random mutations, bad or good. I just think it would be cool seeing a hostile human. They could spawn as random events, much like supply crates or dead soldiers.

For flavor, they could also spew passages from their chosen religious dogma.

Something like this is ultimately best implemented as part of the NPC faction system.

Yeah, sounds like a Spread-The-Fungus faction to me.