Possessed Human (5e Creature)
From D&D Wiki
Medium undead, chaotic evil
Punch. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) bludgeoning damage.
Pistol. Ranged Weapon Attack: +2 to hit, reach 50 ft., one target. Hit: 7 (2d6) piercing damage.
These are former humans – soldiers or security personnel – who have been possessed in their sleep by demonic spirits. Now trapped in their own mind, they are forced into acts of debasement such as cannibalism and self-mutilation. Their skin becomes pale, and their eyes glow red. The demon controls the body only awkwardly, so attack ineffectively – however, they can be encountered by the dozen when a preliminary demonic invasion sweeps through barracks or residential areas.
Survivors sometimes refer to these foes as "dehumans" or "zombies".