'Rigs

Power armor replacing a variety of military hardware. Can also be used for manual labor, with different loadouts. Sometimes called "potatoes" due to squat shape. Can also be very square.
Pilots are casually referred to as 'riggers, but can also just be called pilots or aces.
The common design features are: Lack of a head
But things that can be customized are: Thickness of armor Style changes Leg and arm strength vs speed Weaponry Spotter rack on back to hold an unarmored infantryman to act as support