Not much is revealed about her past, other than the fact that she was once acquainted with writer Cuddlywhiskers. From her brief appearance, it's assumed that she and Cuddly had a sexually aggressive relationship, as she's first seen behaving like a maid, which is followed by a lusty bout of disobedience after being yelled at by Cuddly.
What is known is how she met BoJack, as she was bringing some water to Cuddlywhiskers and BoJack, prompting Cuddly to introduce her.
She is now a playwright in New York City.
She's very reserved and intelligent, possessing a very high opinion of herself, as well as a persistent and demanding presence, seen when she apparently continuously contacted BoJack to remind him of something when her deadline wasn't met, and refusing to stop until it was finished.
She is shown to be very sexually motivated, as shown with her former relationship with Cuddlywhiskers, as well as her repeated attempts to have BoJack retrieve a graphically sexual letter she wrote to Cuddlywhiskers for "sentimental" reasons.
She is shown to have a softer side, as shown in her own self-indulgence, as she knitted herself a spider-silk sweater, and in her interactions with Cuddlywhiskers, where she's seen putting on an act to seduce him.
Jill is a female a black widow spider, and she has a less humanoid appearance than most of the show's animal characters.
She has grey skin, a red hourglass on her chest, six long arms and two legs, which matches the limb count of a spider (eight), eight eyes with indigo eyeliner applied to each, plump lips with blue lipstick, sharp teeth, and what appear to be two sets of pedipalps on her face. Her build is very mechanical, having a broad body shape, while also possessing thin limbs. Despite this, her waist is very large, as widow spiders have very big abdomens when compared to their heads.
Her style seems to be in line with modern hipster-esque tropes. She wears a fuchsia beret, a black long-sleeved top with a white lace-plaid pattern on it and a deep violet belt, a blue skirt with black leggings underneath, and purple, indigo, and light red heels.
In 2007 she wore clothing that could be considered "in style" during that time period. This outfit consists of a dull, greyish-burgundy wig styled into a bun, a pink sweater-jacket with a tied lace, a dark lavender skirt with thin white lines on it, a fuchsia belt, and matching fuchsia high heels. She wears the same lavender eyeliner, and magenta lipstick.
- Start Spreading The News (official debut/first physical appearance)
- The BoJack Horseman Show
- BoJack Kills
- That's Too Much, Man! (flashback)
- She is voiced by Mara Wilson, who is best known for playing Matilda in the film of the same name.