Wendy is a young girl with long black hair and a pink beret with a purple coat and yellow pants with black boots. She is the student body president and Stan’s girlfriend. Wendy is best described as a mature and intelligent kid whose stubbornness and occasional jealousy sometimes get the best of her; Wendy is typically portrayed as nice, feminine, smart, and liberal in nature. She generally provides a voice of reason, usually against Cartman. Wendy is generally friendly to others and seems well-liked at school, but she is unwilling to let her beliefs be compromised by popularity. Wendy is shown to be very intelligent and politically aware. Wendy is a very empathic person and often concerned about those around her. Wendy is shown to be a fairly decent fighter as she beat up Cartman after he repeatedly made jokes about breast cancer. Despite their occasional breakups, Wendy is shown to be very caring to Stan and the two have formed a strong bond. Wendy also becomes somewhat jealous if she feels her relationship with Stan is in danger, but her exact reaction varies based on the situation. Wendy is very active in the school's extracurricular activities: aside from being class president, she is one of three new members of the cheer squad, and she later became Capitain. She’s also the volleyball Capitain of the girl’s team.

Stan’s best friend, Kyle is a young boy with a green ushanka, orange coat with a green collar and dark green pants with black shoes. Kyle is the smartest of The Boys while sometimes becoming arrogant about it. He very rarely becomes cocky about his own intelligence and this also shows that fact that he is usually a very moral and humble person, much like Kenny. Kyle is best friends with Stan. They are the closest out of the four boys, and they are generally seen together on the show, standing next to each other as well as sitting together on the school bus. Kyle shares an affinity with Stan in many ways, and they genuinely care about each other. They almost always side together on the many issues they encounter, mainly when it is Cartman who is opposing them. This is frequently manifested when there is a conflict between Kyle and Cartman, and Stan offers support to Kyle by siding with him.

Cartman is a young, 9 year old boy with a light blue beanie with a yellow trim on the edges and a flat yellow poofball. He has short light brown hair and wears a red jacket, brown pants and black boots. Cartman is best portrayed as a fat, self-centered asshole who only cares about himself. He has no dad and he likes to hate on Kyle for being a Jew. He also speaks with a light, slight-southern accent with mispronunciations of words and bad grammar and making up words, such as saying "seriously" when he's supposed to say "serious" and "I'm very remorsefulness", having very poor language skills. Cartman has no dad. Cartman takes a poop on Kyle’s porch every day to “make him move out”, which never works.

Kenny is a young 9 year old boy with short blonde hair. He wears an orange parka with orange pants and black boots. Kenny is the sweetest boy of the group and is very sexually educated. He is shown to be brave, cynical, and caring for his friends and his little sister, Karen McCormick. Kenny is also known to die a lot, and speaks muffled due to the parka hood. The only ones who understand him are Stan, Kyle and Cartman. He is very loyal to his friends. Kenny is most notably known for his high libido and his poverty, Kenny also had the highest speaking voice of The Boys and even the highest voice of the main five boys, counting Butters as the de facto fifth member. Kenny is also very extroverted and sexually educated. Kenny is known to die gruesomely, causing Stan to yell “oh my god! They killed Kenny!” And Kyle to follow up with “you bastards!”. It is practically tradition at this point.

Bebe is a young, 9 year old girl with wavy blonde hair. She wears a red coat with dark green pants and black shoes. Bebe is known to be kind, extroverted and best friends with Wendy.

Jimbo Kern is Stan Marsh's uncle, a Vietnam War veteran, and a gun enthusiast. He wears an orange hat, orange shirt, green vest, and brown trousers. He is slightly overweight and has a double chin. His jawline is very broad and square. Although Jimbo generally seems amiable, he occasionally has streaks of madness. He likes the idea of being Stan's "cool uncle". He took him hunting, and openly swears in front of him and the boys. Although he has good technical knowledge, having been a pilot and being able to operate many different weapons. Jimbo is 48 years old.

Mr. Testaburger is the husband of Alexis Testaburger and the father of Wendy Testaburger. He wears an aqua shirt, has ginger hair and a ginger goatee, wears dark blue jeans and black shoes. Mr. Testaburger appears to love his daughter very much and cares for her. He doesn’t seem to care about Stan and Wendy’s relationship.

Alexis Testaburger is the wife of Mr. Testaburger and the mother of Wendy Testaburger. She wears a white shirt under a blue cardigan, and wears gold earrings. She also wears a long brown skirt with black shoes. Alexis Testaburger seems to care for her daughter a lot, she may be where Wendy gets most of her liberal ideas from.