Indigo

it doesn't show much emotion on its face, and speaks in very few words. it's not cold or cruel, though! that's just how it expresses itself.
it's soft-spoken and generally obedient. it can't often handle tasks very well, though. it's trying its best..
it can't understand social cues or hidden meanings well. you have to be very upfront and clear with it!
it gets fatigued or burnt out very easily...