Mark has combed blond hair parted on the left side and swept in a smooth style. He wears a yellow jumper over a bright-yellow polo shirt, light blue jeans, and black shoes.
Mark's personality appears to be shaped largely by his family and religion, Mormonism. He is overly friendly and optimistic, like the rest of his family.
Mark is very close to his parents and they are the people who taught him The Book of Mormon.
Mark has two brothers and two sisters. They all share a strong bond and are friendly to each other. They never fight and enjoy spending time together. They all play musical instruments, and perform a song for their parents and Stan Marsh in "All About Mormons".