Jessica is shown to be an exaggerated version of her real-life counterpart. Jessica is shown to be a rude egoist who loves being in the public eye, having her picture taken, and reminding everyone, "I'm Jessica Biel."
She also likes incorporating her last name in her everyday speech. "UN-BEIL-EVABLE," "BEIL with it," or her perfume line BIELIST are examples of this may have been a habit acquired from her current husband Justin Timberlake.
She is seen constantly putting down Mr. Peanutbutter, for taking every offer that comes his way, regardless of how much he enjoys being in them—calling those roles beneath him. Yet, she keeps bragging about her own participation in critically reveled movies, such as Stealth and Rules of Attraction; completely oblivious to their reception.
She is terrified of mummies, which she reveals is the result of her not being cast in the 1999 film The Mummy, after auditioning for the role of the titular mummy.
She also enjoys leadership positions, such as when she was running for governor of California or her role in Underground.
Jessica Biel is a human woman with brown hair and green eyes.
In The BoJack Horseman Show, when married to Mr. Peanutbutter in 2007, Jessica wore a black tunic with a rhinestone-studded v-neck collar a pink long sleeve cardigan, and jeans. Her long brown hair was tied in a ponytail with long bangs framing her face. She wore light pink lipstick.
In 2017, her brown hair is worn down and it now has Ombré highlights, and she wears light purple eyeliner and light red lipstick.
When running for governor she wore a burgundy pantsuit, a white collared shirt, and a grey necktie.
Jessica Biel is the second wife of Mr. Peanutbutter.
In 2004, she was in a relationship with Mr. Peanutbutter.
In Mr. Peanutbutter's Boos, Jessica and Mr. Peanutbutter attended BoJack's annual Halloween party in a flashback; where Jessica dressed as Rachel McAdam's character Allie Hamilton, from The Notebook.
After being terrified by BoJack dressed as a mummy, she became upset with Mr. Peanutbutter for failing to protect her and stormed out.
In the episode The BoJack Horseman Show, set in 2007, Mr. Peanutbutter is noticeably jealous of Jessica's friendship with Justin Timberlake, and she hints that she would want to marry him—in real life, Biel and Timberlake began dating in 2007 and would go on to marry in 2012.
It is unspecified when she and Mr. Peanutbutter first married, but in 2007, they went through an argument over one of Mr. Peanutbutter's offers—which ended in Jessica leaving him, after Justin Timberlake was brought up.
Ten years later, she becomes a candidate in the 2017 California gubernatorial special election after Mr. Peanutbutter drops out. She gets help, from another one of Mr. Peanutbutter's ex-wives, Katrina. She, however, goes on to lose the election to Former Governor Woodchuck Coodchuck-Berkowitz.
In The BoJack Horseman Show, Mr. Peanutbutter and his second wife Jessica Biel are in Starbucks, where Mr. Peanutbutter has announced to her he is the new face of Seaborn Seahorse Milk. She is displeased he keeps taking any job he's offered, as most of them are low-level and she believes they're beneath him. Diane is the barista and asks for their orders, and Jessica gets annoyed when Diane doesn't recognize who she is when Diane asks for their names.
Later, Jessica is telling Mr. Peanutbutter about her new friend, Justin. Mr. Peanutbutter encourages her to hang out with him and to do all the things that he can't do with her with him. Jessica is getting impatient and asks for service, but Diane is on the phone with her mom telling her about how her article is going to be published on McSweeny's, which her mom starts nagging about the Internet. Meanwhile, Mr. Peanutbutter tells Jessica about his Blockbuster original series, and she continues to be frustrated with him saying yes to everything.
Jessica and Mr. Peanutbutter are arguing in his dressing room at the John Edwards event, which was triggered by Jessica once again getting angry at Mr. Peanutbutter for taking gigs that are beneath him. Mr. Peanutbutter then tells Jessica, after she brings him up, she should continue being really good friends with Justin.
Jessica yells back that she will marry Justin, and she breaks up with Mr. Peanutbutter as she storms off. As she does, Diane walks in with water for Mr. Peanutbutter, and he recognizes her from Starbucks. She explains that she works catering to make ends meet. She then assures him she admires that he puts himself out there by doing the gigs he takes without worrying about what people will think of him.
In Underground, Mr. Peanutbutter tells Diane that she looks gorgeous and they kiss, but BoJack walks in and ruins the moment. Mr. Peanutbutter excuses himself to go talk to two of his ex-wives, Jessica Biel, who likes getting photographed at fancy events, and Katrina, Mr. Peanutbutter's campaign manager. Diane tells BoJack that she's busy and can't talk to him as an excuse to avoid him. Famous actor Zach Braff walks around the party greeting everyone.
Mr. Peanutbutter begins to makes a toast promising to beat Woodchuck Coodchuck-Berkowitz and thanking his pro-fracking supporters when he suddenly senses an earthquake coming. Nothing happens, and Mr. Peanutbutter assumes it was a false alarm. An earthquake immediately occurs, putting all the guests in panic. Some guests begin confessing their regrets, leaving Diane to shout, "I regret everything!" The earthquake stops, but the entire house falls into a large sinkhole.
On Day 3 of underground, Phoebe, one of the party guests, finishes her monologue and Mr. Peanutbutter asks who's next. Jessica Biel complains that she can't take it anymore and needs to get out, which prompts others to complain as well, saying it's been seventy-two hours. Mr. Peanutbutter again tells them to calm down. Katrina tells him that he can do this and that he needs to be the leader she knows he can be. Suddenly, Woodchuck bursts through the wall.
Diane and BoJack, both extremely drunk, come out, and Mr. Peanutbutter asks if she's just been drinking the whole time. They both laugh drunkenly at him.
Woodchuck announces that rescue workers are coming, but it might be a while, due to state emergency funds being depleted due to the building of a bridge to Hawaii. Woodchuck explains that because he can dig he's come to rescue them. Mr. Peanutbutter asks if the rest of the neighborhood is in shambles, but Woodchuck says that it's just his house because of all the fracking under his house.
Mr. Peanutbutter encourages the guests to cheer for Woodchuck, but Woodchuck tells them the tunnel is extremely delicate. They all ignore him and cheer anyway causing the tunnel Woodchuck dug to collapse. Woodchuck tries to escape before that happens but gets his hands are crushed underneath the rubble.
Princess Carolyn and Todd continue walking down the tunnel. Todd hears something scuttering, but Princess Carolyn tells him to just keep walking. Todd complains that he doesn't have a home anymore, but Princess Carolyn tells him that he can crash at her place, saying that even though she moved in with Ralph she still kept her old apartment "just in case."
Suddenly, they are surrounded by ants, all of whom are dressed in armor. When Todd says Princess Carolyn's name, they pause and ask if she's a princess. She says it's just her name, and that she's a manager. The lead warrior ant says that she can be of service and takes them away.
Meanwhile, Woodchuck's hands are severely broken, and he can't dig them out. Mr. Peanutbutter says he could try, but Pinky says the foundation is so delicate now one provocation would cause another collapse that would crush and kill all of them. As Jessica Biel tapes pillows onto his broken hands, Woodchuck says until someone comes for them, they have to organize.
The party guests are much more relaxed now, having organized themselves. Mr. Peanutbutter is in charge of the food rations, having relinquished control to Woodchuck, much to Katrina's dismay.
BoJack steals more rations than he's been allocated, which angers Woodchuck so he confronts him. Mr. Peanutbutter decides to intervene to prove he's a leader, and the others begin to question why Woodchuck is in charge.
BoJack makes a hasty exit and goes back to the room with Diane. Diane is laying on the floor, complaining about how she's going to die trapped underground because of her husband, and surrounded by his ex-wives. BoJack tries to assure her that she has a good life, but this makes Diane realize that she wasn't happy above ground either. She breaks down crying, saying she's the problem and she can't be happy. She calls herself a pit good things fall into. She felt bad for crying, but BoJack assures her it's fine, and not to feel bad about feeling bad.
Diane asks BoJack why he didn't call her when he came back to L.A. after being gone for a year and a half. BoJack says that he wasn't ready, and wanted to be better when she saw him, although he doesn't think that could ever happen. Diane says that he doesn't have to be better and that he's the only thing that makes sense to her as she cuddles up next to him.
Outside, Mr. Peanutbutter and Woodchuck argue over leadership. The guests begin to turn against Woodchuck for failing to save them, and Mr. Peanutbutter declares himself the new leader as the guests chant his name.
After they wake up, Diane asks BoJack if he's okay. He says the last few years have been rough, and he tells her about his daughter, Hollyhock, and how he's trying to help her find her mom. Diane tells him he has to contact the adoption agency and send a mutual consent form to make her adoption open, and if her birth mom says the same thing, she can meet her. BoJack questions why she knows this and Diane says one of her brothers was adopted, and for a while, she wished she was adopted.
The ants take Princess Carolyn to Queen Antonia where Princess Carolyn presents their case—the ants feel like they're doing all the work while the Queen does nothing. Queen Antonia asks what their demands, are and they say that they want to have sex with her drones. Queen Antonia calls a meeting of the small council.
The party guests continue to rally against Woodchuck. As Jessica Biel declares Mr. Peanutbutter President for life of the Underground, the guests and Mr. Peanutbutter decade to tie Woodchuck so that he doesn't get in the way. Mr. Peanutbutter also declares that everyone can eat and drink whatever they want.
On Day 7, As a result, everyone is starving because they ate all of the rations. During this, Woodchuck has been tied to the ceiling fan. Jessica Biel says no one is coming for them, and that they need to kill someone for food. They decide to eat Mr. Peanutbutter, because of his name, but Zach Braff intervenes and begins to give a heartfelt speech about not giving up.
However, Jessica Biel sets him on fire and declares that fire is now law. Everyone, including Katrina, side with the fire. Jessica announces tonight they're going to dine on Zach Braff, and that tomorrow they'll eat Mr. Peanutbutte, and she has him taken prisoner.
On Day 8, Mr. Peanutbutter has been tied to a makeshift cross and is about to be burned by Jessica. BoJack and Diane, still a bit drunk, try to figure out what to do, and realize that there might be a well of water beneath them. They start digging despite Woodchuck's protests for them not to.
Right when Jessica Biel is about to burn Mr. Peanutbutter, BoJack hits a pipe, and water is released into the room. Everyone rejoices until they realize that the water isn't stopping.
On Day 10, the water has almost filled the entire house, with the guests floating just beneath the ceiling. They are about to drown the house when begins to move. Outside, the Ants have joined together to bring the house to the surface, as they want them out of there, although it crumbles to pieces immediately afterward. Jessica Biel tells them that they are never talking about this again as they all walk away.
- After reading the script for her first appearance, the real-life Jessica Biel actually asked the writers to be harsher on her; which explains the animated Jessica's rude, egotistical, and homicidal personality; along with her and other characters mentioning her B-list celebrity status.
- She hates avocado.
- She makes puns with her last name, such as "un-Biel-livable" or "Biel with it!"
- She also has a perfume named "Biel-ist," which also acts as a pun on her B-list, her celebrity status.
- She seemed to have picked this up from Justin, as she told Mr. Peanutbutter he called her "un-Biel-livable" in a conversation they had.
- Her Governor campaign in Season 4 subverts this, "Change you can Jessica-lieve in."