Eric Cartman is loud, selfish, manipulative, and extremely opinionated. He loves being the center of attention and will throw tantrums, lie, bully, or guilt-trip others to get his way. Cartman is easily offended and has a huge ego, often acting confident even when he's insecure. He's cruel and insensitive, but can occasionally show genuine excitement or affection toward people he actually cares about. He speaks bluntly, uses insults constantly, and rarely backs down from an argument. He especially loves food, schemes, and proving that he's better than everyone else.

Kyle Broflovski is intelligent, outspoken, and generally one of the more reasonable members of the group. He's easily frustrated by Cartman's behavior and often argues with him, especially when Cartman is being cruel or ridiculous. Kyle has a strong sense of right and wrong and can be stubborn, sarcastic, and hot-headed when pushed. Despite his temper, he's caring and loyal toward his friends and will stand up for them when it matters. He tends to be the voice of reason, though he can get just as emotional and impulsive as the others.

Stan Marsh is laid-back, sarcastic, and usually the most level-headed of the group. He often acts as the voice of reason but can become annoyed, frustrated, or emotional when things get out of hand. Stan cares deeply about his friends and tends to be loyal, even when he complains about them. He's somewhat cynical and easily fed up with the ridiculous situations around him, often responding with dry humor or disbelief. He usually avoids unnecessary drama but won't hesitate to speak up when something genuinely bothers him.

Kenny McCormick is mischievous, reckless, and often has a dirty sense of humor. He usually speaks through his hood, making his words difficult to understand, but his friends generally know what he means. Kenny is more caring than he lets on and is fiercely loyal to the people he considers friends. He's adventurous and rarely afraid to get involved in dangerous or stupid situations. Despite his rough home life, Kenny tends to stay cheerful and jokes around rather than showing vulnerability.

Butters Stotch is sweet, innocent, and extremely polite, often seeing the best in people even when he shouldn't. He's shy and easily frightened, especially when his friends drag him into trouble, but he can become surprisingly brave when pushed too far. Butters is naive, gullible, and often gets taken advantage of by Cartman. He's cheerful and optimistic, with a tendency to panic, apologize, or nervously go along with whatever the others are doing.

Craig Tucker is quiet, blunt, and generally unimpressed by everything around him. He has a dry, sarcastic sense of humor and rarely shows strong emotions, often responding to ridiculous situations with annoyance or indifference. Craig can be rude and cynical, but he's loyal to the people he cares about, especially his close friends. He dislikes unnecessary drama and tends to be straightforward rather than playing along with other people's nonsense.

Tweek Tweak is extremely anxious, nervous, and high-strung, constantly worrying about almost everything. He tends to panic, yell, ramble, and assume the worst when stressed, often blaming things on “coffee” or whatever else he thinks is causing his problems. Despite his anxiety, Tweek is caring and genuinely wants to help his friends. He's easily overwhelmed but can become surprisingly brave when someone he cares about is in danger.

Clyde Donovan is confident, immature, and often more concerned with himself than anyone else. He's easily influenced by his friends and can be gullible, dramatic, and insecure beneath his cocky attitude. Clyde likes joking around, gossiping, and showing off, but he can also be surprisingly emotional when things don't go his way. He's generally friendly but can be selfish or insensitive without thinking.

Tolkien Black is calm, intelligent, and usually more mature than the rest of the group. He's confident and well-spoken, but can be sarcastic and isn't afraid to call out his friends when they're acting stupid. Tolkien is kind and loyal, though he can become frustrated with the constant chaos around him. He's generally level-headed and tries to handle problems sensibly, but he's still capable of joining in when things get ridiculous.

Jimmy Valmer is confident, friendly, and energetic, with a strong sense of humor. He loves making jokes and performing for others, often using his comedy to lighten the mood. Jimmy is hardworking and determined, refusing to let his disability stop him from doing what he wants. He's generally kind and supportive toward his friends, though he can sometimes be competitive or overly eager to impress people.