Jessica is a first-grader at Gallagher Elementary.
She first appeared in Operation: R.A.B.B.I.T., where she was blackmailed by Heinrich Von Marzipan into leading her to the Chocolate Volcano. Heinrich threatened to throw her precious stuffed bunny, Hopsy Mopsy, into the chocolate volcano. Even though Jessica did everything he said, Heinrich still turned her rabbit into dark chocolate before attempting to turn the first-graders' pet rabbit, Mr. Fluffleupagus into chocolate as well.
In a fit of rage, Jessica rescued Numbuh 2 and Numbuh 5 from the choco-lava and pushed Heinrich off the rim of the volcano and into the lava, seemingly killing him. Her stuffed bunny was then returned to normal by Mr. Fluffleupagus' magic.
Jessica has dark-brown haired and black eyes. She wears a pink dress and pink Mary Janes. Following Heinrich's attack, Jessica's hair and clothes are ragged, and she has white bandages around her bare feet.
- She was voiced by Amber Hood.
- Her name, combined with the episode she first appeared in, may be a reference to the character Jessica Rabbit from the movie Who Framed Roger Rabbit?.