A rambunctious bunch of simple-minded homunculi, Minions are a similar size and shape, but have unique features to tell them apart, such as height, number of eyes, roundness or secondary features such as hair, eye/pupil size or clothing.
Minions wear metal goggles accommodating their number of eyes, blue overalls with Gru's emblem on the front, and small black gloves.
Minions possess few additional physiological characteristics; with a crack and a shake, they can double as glow sticks for activities in the dark, such as going through ventilation ducts. They additionally can survive without air, as one is seen in outer space without oxygen in Despicable Me.