|“||Drop the butter knife, bitch!||”|
|— Jellybean to Penny[src]|
Jellybean is the younger sister of Jughead Jones and the daughter of Gladys and FP Jones. She is also a member of the Toledo Serpents. As well as a Junior mechanic, as she was shown working under a car in her mothers compound of old car parts.
Is wise beyond her years, and her favorite bands are Pink Floyd and Black Sabbath. Jellybean lives with her biker mom in Toledo where they run scams to make ends meet. And like mother like daughter: Jellybean — who goes by JB now — is quite the little con artist herself.
When Jellybean was younger, she and her family would spend a lot of time at the Twilight Drive-In, however, they often could not afford tickets for everyone, so the kids would hide in the trunk until they parked.
After Fred Andrews fired her father and he began drinking heavily, Jellybean and her mother went to live with Jellybean's grandparents in Toledo where she started to go by J.B. instead.
The Drive-In & Moving to Toledo
Jellybean was briefly seen in an old photograph of Jughead's when he was leaving the Twilight Drive-In, for the last time. According to Jughead, they would hide in the trunk of their parents' car until parking, as their family was often low on funds, and so sneaking into the drive-in was their only option. 
Jughead mentioned that he spoke with Jellybean over the phone. She wanted to be addressed as 'JB', instead of Jellybean because she thought it sounded cooler. He remarked that "she's ten years old, and listens to Pink Floyd on vinyl. I don't think she could get any cooler." Jughead also mentioned that she was helping their mother study for her GED. 
Jellybean reunites with her older brother Jughead after he and his best friend Archie Andrews unexpectedly shows up at the junkyard in Toledo. She remarks that she thought she smelled something rotten and they give each other a hug.
Jellybean and her mother Gladys discover the reason why Jughead and Archie left Riverdale; they’re running from Hiram Lodge. Gladys always knew he was trouble, but she questions what his vendetta is with Archie. They reveal that Archie was the only one who stood up to him. Not to mention that Archie also dated his daughter. Jellybean is pleased to hear that Archie is no longer dating and single. When Jughead tells Jellybean to relax with her excitement, she reminds him that she now goes by JB. Gladys asks if Archie’s spoken with his dad during any of this, which he hasn’t. Archie wishes he could, but it’s too risky. Archie and Jellybean then take off to eat.
Jellybean thwarts Penny Peabody's attempt to claim the bounty on Archie. Jellybean, who is armed with nothing more than a slingshot, confronts Penny as she holds Archie at knife point. When Penny refuses to drop the knife, Jellybean shoots her in the head, knocking Penny unconscious. They then they tie Penny to a chair and begin interrogating her. Gladys isn’t at all surprised that Penny is working with Hiram since she always had unfixed allegiances. She is however surprised that Penny isn't ratting Hiram out yet, leading Gladys to suspect that Hiram must have something on her. While Penny isn’t a snitch, she will say this; Hiram won’t stop until he gets Archie. And there’s nothing anyone can do. Gladys then addresses the fact that Penny carved off Jughead’s Serpent tattoo. Penny states that was business between her and Jughead. Gladys retorts that she’s Jughead’s mother, also making it her business. Gladys grabs a large hunting knife and tells everyone to go inside. Before doing so, Jughead tells Gladys to ask Penny about Gryphons and Gargoyles and how Hiram fits into it all.
The following morning, both Archie and Jughead prepare to leave, but to different destinations; Archie to the border and Jughead to Riverdale. Just outside stands FP, Jellybean's father, waiting to take Jughead home. FP is shocked at how big Jellybean has gotten since he’s last seen her. He asks for a hug. In response, she sarcastically asks for a dad and walks off, a response that FP admits was warranted. Gladys insists that Jellybean misses him, but that she would rather fight it than admit it. Like mother, like daughter, FP replies.
Jellybean and Gladys unexpectedly returns to Riverdale. They surprise Jughead and FP at the trailer. Jellybean greets both her father and brother with a hug. Gladys then gives Jughead, who wonders what they’re doing in town, a hug. Gladys informs the boys that she and Jellybean aren’t just there to visit. They intend to stay awhile.
Jellybean and Gladys hangout at the trailer, and as it seems, they are there for much more nefarious reasons than they’ve lead on. Jellybean remarks that she has FP wrapped around her finger. Gladys adds that Jellybean is FP’s weakness. Which means, they have the whole town. FP is the Sheriff. The mayor owes them a ton of money, and she even has Veronica working for her.
Jellybean heads into the kitchen to grab a cup of coffee, which FP initially questions, but decides to let go. Later, as Jellybean has dinner with with mother and father, Jughead returns home. He reveals that the Ghoulies no longer exist. They’ve joined the Gargoyles. They’re the same guys just in a different mask Gladys states. She still thinks Jughead should’ve recruited them, but Jughead doesn't. He wants to find another way to save the Serpents as Gargoyles aren’t the answer. Jughead explains to them just how deeply lost the Gargoyles are into G&G.
As Jughead and Jellybean watch a horror film, several Gargoyles barge into the trailer. Jughead pulls out his knife and Jellybean her slingshot. Surprisingly, the Gargoyles did not come alone. It seems they are now under Gladys’ command. She did what Jughead couldn’t. She tamed the Gargoyles. She then tells them to take off their masks. Kurtz is one of the Gargoyles at Gladys’ disposal. Jughead explains that this can only end badly, which may be true, but they’re desperate by Gladys’ standards.
At Sunnyside Trailer Park, in the Jones’ trailer, Jughead types on his laptop as Jellybean, their mother and father enjoy breakfast in the kitchen. Gladys tells Jellybean and FP to eat up because afterward they’re taking a ride to a surprise location. Gladys then proceeds to groom FP as Jughead watches contentedly.
The aforementioned surprise is that she bought a house. Unbeknownst to her, she purchased the Cooper house, which they don't realize until Alice and Betty exit the house with boxes. They head inside, where FP inquires about the scorch marks, which Alice claims to be the result of a minor mishap with a candle. Betty questions how her mother could sell the house to the Jones, but it was solely Gladys who made the purchase. She made an all-cash offer online. Both Jughead and FP are hesitant with moving in given that it is the Cooper house. FP wants to walk away from this, but Alice doesn’t think it’s necessary. The house is her past and she wants to be done with it.
Jellybean later attends her father's 50th Birthday Party at La Bonne Nuit along with her mother, Jughead, and Betty. After Gladys gets on stage to thank everyone for coming out, Jughead gives a speech
Jellybean eats pizza by the fireplace with Jughead, their mother, and Betty. FP then returns home from an incident at work. He’s bleeding from being scratched and asks Jellybean to get him a clean shirt. FP reveals that some tweaked-out Fizzle-head was playing Gryphons and Gargoyles in the middle of the road. The candy store is definitely back open and FP intends to find whoever is cooking the Fizzle Rocks. As Gladys cleans FP’s wounds, Jughead and Betty get ready to leave. He claims that they need to make a quick stop before heading to the play. A little pre-show tradition.
Later, Jellybean, Gladys, and FP attend the school musical, Heathers. The musical ends with Betty, Jughead, Archie, Sweet Pea, Toni, Reggie, Josie, Veronica, Cheryl, Kevin, Evelyn, and Fangs on stage singing "Seventeen". As the musical concludes, Edgar Evernever rises from the audience, clapping slowly and very dramatic-like. He is joined by over a dozen members of the Farm, who are all wearing white and join in on the slow clap.
During breakfast at the Jones house, FP reveals how one of his deputies found their old trailer burned down with drug material inside. Jellybean then pulls him away with the promise of Saturday morning cartoons.
Jellybean plays Gryphons and Gargoyles with Ricky at Pop’s. Jellybean has just lost the game and apparently she’s a new player. She asks if they can play another round. Ricky wonders if her parents will be worried about her being out for so long. However, as Jellybean explains, her parents are often too busy to notice her.
Ricky leads Jellybean through the woods while on a quest. When she questions why they couldn’t continue the game at Pop’s, he tells her it’s because "he" wanted to meet her. He being the Gargoyle King, who appears before Jellybean and Ricky.
After meeting with the Gargoyle King, Jellybean continues to play G&G with Ricky. The return to her house, where Jellybean speaks with Jughead over the phone. She tells Jughead that she just got home and that she’s been playing G&G even though Jughead told her not to. He tells her it’s okay and that he’ll see her soon. Jughead then returns home to find Jellybean unharmed. As they share a hug, Jughead asks about Ricky, who Jellybean claims left after they spoke on the phone.
Much to Jellybean's dismay, her mother is leaving town without her, as Jellybean will be staying in Riverdale with her dad and brother. When Jellybean asks to join her, Gladys tells her that she’s better of in Riverdale, just before hugging Jellybean.
At the Jones house, Jellybean is still upset about having been left behind by her mother. Jughead explains to Jellybean that she wasn’t abandoned and their mother leaving town was probably the most selfless thing she had ever done. Still, Jellybean has never lived anywhere without her. Jughead expresses his joy in her staying but while she’s there, Jughead insists that she doesn’t play G & G again. Jellybean, however, doesn’t see the big deal. As far as she’s concerned, it’s just pretend quests in costumes, to which Jughead inquires further about the costumes and who was wearing them. Jellybean tells him about Ricky’s ears and her crown. Not to mention the Gargoyle King, who Jellybean met in person. He gave her a quest. He said that she couldn’t enter the Kingdom until she found the gospel, though Jellybean and Ricky never found it. The Gospel is where the Gargoyle King keeps all his secrets.
Jughead looks to Jellybean for answers in hope that she knows of Ricky’s whereabouts. Jughead tells her how he has been working for the Gargoyle King, which is putting a lot of people’s lives in danger. Jellybean reveals that Ricky is in Fox Forest, preparing to ascend. Hoping to get to Ricky before it’s too late, he asks that Jellybean draw him a map.
As a child, she was slim and short with medium-length black hair and brown eyes. Now, as a preteen, her hair is light brown, but her build is still slim and short as she hasn't reached her adult height.
She is an assertive individual and has a no-nonsense attitude due to her tough upbringing. Unlike her brother, Jughead, she is not as close to her father and resents him for being distant after the separation of her parents. It is known that she likes Pink Floyd and movie theaters, much like her older brother. She also appears to be a very obedient child as shown when she informed her mother she did exactly as she told her to do with her father, stating that she had succeeded in having FP wrapped around her fingers.
|“||By the way, Jellybean wants to go with JB now. She thinks it sounds cooler.She's 10 years old and listens to Pink Floyd on vinyl, I don't think she could get any cooler.||”|
|— Jughead about Jellybean[src]|
Jellybean's relationship with her brother, Jughead remains vague given that she and Jughead were separated by their mother's move to Toledo to stay with their grandparents. She went with their mother while Jughead stayed behind with their father. Jellybean seems to be very close to her brother, even mocking his arrival to her mother's garage albeit demanding another Serpent to let him through the gates with Archie. Jughead also thinks very highly of his sister and mentions her several times, such as when he told Sierra McCoy about their family's trips to the Twilight Drive-In.
When Jughead reunites with Jellybean, she also meets Archie. They appear to be friendly towards each other. Later that night, when Archie mentions that he used to date Hiram's daughter, Jellybean takes this to mean that Archie is now single, exposing the obvious fact that she has a crush on Archie. Later, when Archie is attacked by Penny Peabody, Jellybean saves him by shooting Penny in the head with her slingshot.
- She listens to Pink Floyd on vinyl.
- She prefers to be called "JB", a possible reference to JB Moranville, a Riverdale producer who unfortunately passed away in October 2016.
- In the Archie Comics, her real name is Forsythia Jones, a mirror to Jughead's real name Forsythe.