Jenny has long, strawberry-blonde hair. She wears an outfit similar to her mother's. She wears a pink, long-sleeved, collared jumper under a sleeveless blue jumper, a long turquoise skirt, gray leggings, and black shoes.
Jenny's personality appears to be shaped largely by her family and religion, Mormonism. She is overly friendly and optimistic, like the rest of her family.
Jenny is very close to her parents and they are the people who taught her The Book of Mormon.
Jenny has three brothers and one younger sister. 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".