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The Astronaut is a special enemy appearing on the map Moon, often taking the name of someone on your friends list or if solo a predetermined name instead.
The Astronaut has much higher health than a normal zombie and moves slowly. Most of the time, they should just be ignored; however, if you want to get rid of him for a round, the best way to kill him is by throwing a Q.E.D. at its feet and making sure they are in the center of the blast radius, resulting in an instant kill.
Besides that, shotguns are typically the best weapons to use against him or weapons using the 
Dead Wire ammo mod
in the Black Ops 3 version of the map.
Napalm Zombies are a special enemy appearing on the map Shangri-La. These zombies look like a burnt zombie with a flaming aura surrounding them.
The Denizen is a special enemy appearing on the map Tranzit, lurking within the fog of the map waiting for unsuspecting players to jump onto.