This humanoid looks just like they stepped right out of the pre-apocalypse, with clean-cut hair, dressed in a smoking jacket and dress pants, and smoking a pipe. "Howdy, sport!" it says with a smile.
There was a time when the world was falling apart and robots were taking over that humans decided if they couldn't beat 'em, they would join 'em. And so the stepfords were born: human minds downloaded into mimetic polyalloy androids. The creation of stepfords went beyond digital immortality -- it was the promise of the start of a new life of the 1950s, where the rising middle class mowed their lands, read the paper, and smoked their pipes.
The decadence of the apocalypse has driven stepfords slightly mad. They abhor chaos, disorder, and disrespect, and seek to remold communities into 1950s-style suburbia. They will stop at nothing to do this, including murdering anyone who doesn't fit the mold -- women who don't want to be housewives, men who don't have decent jobs, and anyone who doesn't own a home. In other words, everyone has to look and act like them. Stepfords have a 1950s optimistic vision of the future; robots are fine, mutants are not, and radiation is to be avoided at all costs.
To further their own ends, stepfords start out looking like a member of the local humanoid populace. They blend in at first, slowly but surely transforming the community and themselves into a 1950s suburb. For those who do not fit into their backwards vision of a suburban utopia, the stepfords become lethal assassins, eliminating the unkempt and the uncouth, hiding the bodies, and then going right back to mowing the lawn.
Medium humanoid (android, nanotech)
Armor Class 15 (natural armor)
Hit Points 30(4d8+12)
Speed 30 ft.
STR | DEX | CON | INT | WIS | CHA
16 (+3) | 13 (+1) | 16 (+3) | 13 (+1) | 10 (+0) | 18 (+4)
Damage Immunities necrotic, poison
Damage Resistances acid, bludgeoning, piercing, slashing
Condition Immunities exhaustion, poisoned, petrified
Skills Deception +6, History +3, Insight +2, Intimidation +6, Persuasion +6, Sleight of Hand +3, Stealth +3
Senses darkvision 60 ft., passive perception 10
Challenge 2 (450 XP)
Shapechanger. The stepford can use its action to polymorph into a Medium humanoid it has seen, or back into its true form. Its statistics, other than its size, are the same in each form. Any equipment it is wearing or carrying isn't transformed. It can create melee weapons of any type as part of this change. It reverts to its true form if it dies.
Ambusher. In the first round of a combat, the stepford has advantage on attack rolls against any creature it has surprised.
Surprise Attack. If the stepford surprises a creature and hits it with an attack during the first round of combat, the target takes an extra 10 (3d6) damage from the attack.
Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 7 (1d8 + 3) bludgeoning, piercing or slashing damage, determined by form.