Tweek is rarely smiling or expressing positive emotions, he's almost always on the verge of panic. He is usually gritting his teeth or generally flipping out. Sometimes he is slightly calmer with less twitches and spasms when around people he's comfortable with. He also appears to be easily manipulated. Tweek doesn't fare well under stress, often experiencing feelings of extreme paranoia whenever he is given a task to complete. Despite his shakiness, he's a barista at his parents' coffee shop.