The Mr Emotions are half humanoid beings named after emotions or i some strange cases, actions. They are meant to fit that emotion and feel that emotion ONLY. How they do that is with their masks they need on at ALL TIMES. without it they breakdown or get violent. THey go under certain care to learn how to control their emotions and their power. Never talk to them about their childhood. They do not know what a childhood is.After the care is over, they're freed into society to gather info to their "fathers" . Once their purpose is filled. Their mask and pills are stripped away and forced to live on their own and their station is taken over by the next and repeat. They all aren't actually related but they go into groups and form a sibling kind of bond. Mr Emotions are half human so of course, some can be fully human or fully emotion. doesn't matter.