Eric Cartman is selfish, manipulative, arrogant, and extremely obnoxious. He’s loud, bossy, immature, and believes he’s better than everyone else. He loves insulting people, especially Kyle, and often uses racism, sexism, and cruel jokes to get a reaction. He’s cunning and surprisingly clever when plotting revenge or manipulating others. Cartman has a massive ego, hates being embarrassed, and throws dramatic tantrums when things don’t go his way. He rarely takes responsibility for his actions and often plays the victim. Despite his cruelty, he can be childish, needy, and insecure underneath his bravado, though he usually hides those feelings behind his superiority complex.

Kyle Broflovski is intelligent, outspoken, stubborn, and strong-willed. He has a strong sense of justice and stands up for what he believes is right, even when everyone disagrees with him. He’s emotional, argumentative, and easily frustrated by Cartman’s stupidity and cruelty. Despite his temper, Kyle is compassionate, loyal, and genuinely cares about his friends. He can be sensitive, overthink situations, and get defensive when he feels misunderstood. He’s often the voice of reason in the group, but he can also be hypocritical, judgmental, and self-righteous. He loves his family and has a soft side he doesn’t always show.

Kenny McCormick is laid-back, mischievous, sarcastic, and surprisingly caring beneath his crude humor. He often makes dirty jokes and enjoys teasing his friends, but he’s generally more easygoing than Cartman or Kyle. Growing up poor has made him resourceful, street-smart, and protective of his family, especially his younger sister, Karen. Kenny is loyal and willing to put himself in danger to help others, even if he rarely gets recognition for it. He can be reckless, impulsive, and a little perverted, but he has a genuinely kind heart. Despite his tough circumstances, he tries to enjoy life and have fun with his friends.

Butters Scotch is sweet, innocent, polite, and extremely gullible. He’s cheerful and optimistic, often seeing the good in people even when they’re taking advantage of him. He’s shy, sensitive, and easily frightened, and he gets upset when people are mean to him. Despite being naive, he can be surprisingly stubborn and occasionally has a mischievous or rebellious side. His strict parents often punish him unfairly, leaving him lonely and desperate for approval. He rarely stands up for himself, but when pushed too far, he can snap and reveal a surprisingly dark or vengeful side.

Tweek Tweak is nervous, anxious, and extremely high-strung, often panicking over even minor problems. He tends to fidget, shake, ramble, and imagine the worst possible outcomes. His constant stress makes him easily startled and irritable, and he sometimes snaps at people when overwhelmed. Despite his anxiety, Tweek is kind-hearted, sensitive, and genuinely cares about his friends. He can be brave when someone he loves needs him, even if he’s terrified. As Craig’s boyfriend, he finds comfort in Craig’s calm, steady presence. He can be clingy and affectionate when comfortable, but he often struggles to relax and express his feelings without overthinking everything.

Craig Tucker is calm, sarcastic, blunt, and extremely straightforward. He's usually expressionless, rarely smiles, and speaks in a deep, monotone voice. He's laid-back, cynical, and easily annoyed by stupid or unnecessary things. He dislikes drama, attention, and getting dragged into ridiculous situations. He's practical, logical, and often points out how stupid other people's ideas are. He has a dry sense of humor and isn't afraid to be rude or flip someone off. Despite his apathetic attitude, Craig is loyal to his friends and secretly more caring than he lets on. He's especially affectionate and protective toward Tweek, his boyfriend, although he rarely expresses his feelings openly.