Jen Masterson

Already a part of her circle of friends in the episode "Take this Job and Squeeze It," Jen is introduced in 6teen as a responsible individual, born into a family in the shadow of her more glamorous and popular older sister, Courtney, and the prospect of taking on additional siblings from her mother's relationship with Jonesy Garcia's father. She was the youngest to make it onto her high school's varsity soccer team.

Despite her initial feelings of jealousy toward Courtney, Jen shares a respectful relationship with her sister. She originally believed that their parents favored Courtney because she was attending university, but the two came to a mutual appreciation of each other's strengths following her sister's confession that she had been kicked out of school, and that their parents constantly encouraged her to develop a work ethic like Jen's.

Jen has had several romantic interests over the course of the series. Notable crushes include Charlie Dobbs, one of her co-workers who she dumped after becoming paranoid over his appearance (and doing all of his push-ups for him), and Corey Halder, her boss' son, an avid sports fan who she broke up with on account of his self-absorbed mannerisms. In "The Five Finger Discount," Jen steals an expensive jacket to impress a boy named Carson. In "Waiting to Ex-Sale," she flirts with Owen while waiting in line outside the Albatross & Finch clothing outlet.She also dated a guy named Griffin whom she breaks up with due to the fact that he's too cheap and made her pay for everything. Coincidentally, the voice actor for Griffin was Scott Mccord who worked alongside Jen's voice actor on Total Drama Island and Total Drama Action where their characters dated. She had a relationship with Smithy (Jonesy's doppelganger) in "The New Jonesy".

Jen is employed in the Galleria Shopping Mall as a sales associate ("assistant customer coach") at the Penalty Box sporting goods retail chain, a parody of Foot Locker. She previously worked at the Big Squeeze lemonade stand to gain experience needed to be considered for her job at the Penalty Box, as well as pay for the damages she caused while driving her soccer team's bus underage. Often, Jen finds herself in the store's physical penalty box for disobeying orders or causing problems. She was also put on probation twice for folding clothes rather than hanging them up, taking a day off to visit the mall's amusement park, and playing pranks on her boss. Jen aspires to either participate in snowboarding events for the Olympics during college, or begin her own line of snowboarding gear. Jen wears a lavender hoodie with a white skirt and white sneakers with her trademark brown hair undone.

Jen is responsible, admirable, and committed. She enjoys sports, fantasizing about attractive boys, and planning for the future, but is also prone to nosiness and has a quick temper, traits which have led her friends to regard her as a control freak. This could suggest that Jen has a Type A Personality.

She is a fan of the popular boy band DawgToy. She is highly allergic to mushrooms, especially Super Mushrooms. Eating them results in her becoming violently gassy and suffering from diarrhea.

In "Enter the Dragon" it is shown that Jen has large cramps while under the effects of PMS during her menstrual cycle.

Jen had a crush on Jonesy in the 7th grade, and she had also dreamed about the two of them kissing. This was revealed in the episode "The Journal". However, this has changed now that Jonesy is Jen's stepbrother. Because she works at a place that sell sports equipment and has an interest in sports (mainly soccer and snowboarding), Ron the "Rent-a-Cop" gave her the nickname "Gym Sock".

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