Jenny Simon is a female student at South Park Elementary. She made her first appearance in "The List", as a co-chair of the List-making committee and a member of the counterfeit list conspiracy, her other major role was in "Bass to Mouth".
In her first appearance in "The List", she was co-chair of the list making committee and helped forge the list to make Clyde Donovan the most popular boy in order to get shoes with all of the other members, except for Wendy Testaburger, who later foiled the plot with Stan Marsh. Although she isn't seen often, the fact that she is co-chair of the List Committee may mean that she is part of the "popular girls" clique. She came up with the idea to make a list of liars so nobody would believe Wendy.
Her other major appearance is in "Bass to Mouth", in which her full name is revealed. Cartman tricks her into eating a cupcake filled with laxatives, which makes her defecate in class. Following this incident, Jenny attempts suicide by jumping off a roof, but survives the fall with a broken pelvis. In "Bass to Mouth", she was put on suicide watch, however, she has presumably been taken off suicide watch, as she was seen as a new member of the cheerleading squad in "Cartman Finds Love".
Jenny has long black hair; compared to Wendy Testaburger, her hair is shorter and her bangs are a bit longer. She wears a light blue jacket with dark blue trim, dark blue trousers, and a large purple headband. In "Cartman Finds Love", she was seen wearing purple gloves outside.
Jenny has a relatively complicated personality. In "The List", she is shown to have no guilt/remorse over undermining a friend as well as several boys' reputations in order to benefit herself, hinting at a lack of empathy, although, aside from Wendy Testaburger, the rest of the girls were doing the same, so her actions could have been due to deindividuation as her future Appearances contradict her being remorseless.
However, she also seems to still be relatively nice and naive, in "Bass to Mouth." Although she seemed to know about how mean Eric Cartman is, she felt guilty for refusing to like him back and turning him down after he offered her a cupcake and apologized because "[that] was mean" and accepted the cupcake. She also seems sensitive to social harm shown by the fact she tried to kill herself from the torment and ridicule after defecating her pants due to a laxative spiked cupcake prank. Fortunately, the suicide failed.
Since her suicide attempt, Jenny has been seen in "Cartman Finds Love", where she is seen as a new member of the cheerleading squad and is good friends with them.
From all this info we can tell that her personality is naive, nice and socially sensitive, like an ordinary girl her age.
Mr. and Mrs. Foley
Jenny's family is seen in "The Ring". The father is actually Mr. Foley from "Ginger Kids", as is the mother and youngest daughter, except that their hair is now blonde. It is assumed that they are very religious. She appears to be sisters with Blonde Girl. It is possible that their family is more well off than most families in South Park, considering in "The Ring" they were preparing to watch the Jonas Brothers' concert in 3D, meaning they have a 3DTV, which is quite an expensive commodity.
- On her page on the Offical South Park Website, it states that "rumor is she wants to exact revenge on Cartman someday" for the laxative-tainted cupcake he gave her in "Bass to Mouth" to deliberately make her defecate in front of the whole class. This implies that Jenny will have a major role in future episodes where she plans revenge on Eric.
- She is one of the five girls in South Park Elementary whose family is revealed, the others being Nichole, Wendy, Heidi, and Bebe.
- In Bass to Mouth, she has been revealed to have a boyfriend who called her, "Soft-served Simon". However, the mention of her boyfriend is never brought up again. This could mean either she broke up, or a boy falsely claimed he was in a relationship with her.
- "The List" - Co-chair of the List making Committee. (First speaking role).
- "Super Fun Time" - Seen holding hands with Riley at Pioneer Village.
- "Breast Cancer Show Ever" - Seen watching the fight; background only.
- "Elementary School Musical" - Talks to Bridon Guermo at the end of the episode.
- "The Ring" - Was seen in the Jonas Brothers' concert, also seen in the crowd at the Good Mornin' Denver interview and at home watching the Jonas Brothers concert. It is possible that she is a strict Christian.
- "Super Fun Time"- Seen as part of the field trip.
- "Bass to Mouth" - She is tricked into eating a cupcake spiked with laxatives by Eric Cartman, causing her to defecate during class.
- "Jewpacabra" - Seen at the Easter egg hunt.
- "Butterballs" - Seen in Stan's anti-bullying video.
- "Cartman Finds Love" - Seen amongst the cheerleading squad, at Bebe's sleepover party, and walking with Lola.
- "The Cissy"- Briefly seen in the hallway.
- "Stunning and Brave" - Scared by PC Principal while walking down the hallway.
- "Where My Country Gone?"- Seen on the playground.
- "Sponsored Content"- Seen in the hallway.
- "Skank Hunt" - Seen in the school's library.
- "Wieners Out" - Seen in the school cafeteria.