With expressionless and mysterious features, he is described to be very hard to 'read' much like his master. Though by many first impressions he may seem very emotionless at times, but he also seems to be the possessor of a temper when his space is invaded, someone doing something to him without asking politely or when someone hurts him or his master Kiku, he can be very scary if anyone hurts or teases Kiku since he cares for him very much as he was the one to have given him a home to live in, and any other necessity. But he is also a person of deep feelings. Pochi isn't biased, but could hold a grudge like no tomorrow. He is not a mute or unable to talk, but he can talk butwill only want to when he feels the need to talk to save energy.
*None of these images belong to me*