When first introduced, Kelly appears to be a creature made entirely of aquamarine hair, with her only other characteristics being eyes and legs. Near the end of the episode, however, she is revealed to be a teenage girl with brown skin and long bushy hair that usually covers her whole body and stretches down to her ankles. Underneath her hair, Kelly wears an oversized pink-and-white-striped sweater, black shorts, pink boots with aquamarine tassels, and big round black-rimmed glasses.
In "Starcrushed", Kelly wears her long hair tied in a ponytail with a pink hair tie.
In "Goblin Dogs", Kelly first appears as part of a long line of customers who want to buy Goblin Dogs, having saved a spot in line for Pony Head, Star Butterfly, and Marco Diaz. Whenever Marco tries to talk to Kelly, she remains silent. At one point, the only sound she makes is the crunching sound of eating apples.
Near the end of the episode, however, Kelly finally speaks up when Star, Marco, and Pony Head question whether or not Goblin Dogs are real. Together with her new friends, Kelly enjoys a Goblin Dog, though she admits she resents what she has to go through every time in order to get one.
The end of the episode also reveals that Kelly has a boyfriend named Tad, a short hairy creature who hangs out in her hair.
In "The Bounce Lounge", Kelly joins Star, Pony Head, and the rest of their old Bounce Crew in saving the Bounce Lounge from being closed - mainly to get her mind off her recent breakup with Tad. Near the end of the episode, she and Tad get back together.
In "Starcrushed", Kelly (once again seperated from Tad) helps Star get her mind off her strained friendship with Marco. She is also present when Star confesses her crush on Marco to him, just prior to her return to Mewni.
- Theme Song (seasons 2 & 3)
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- When Kelly's body is covered up by her hair, she bears a significant resemblance to the Addams Family character Cousin Itt.
- Kelly breaks up with Tad often, as she states in "Starcrushed" that they're on their third break that week.