Quinn Fuller is a jewelry designer and the proprietor of Quinn Artisan Jewelers, which she ran with her son, Wyatt Fuller, for many years. Quinn bore Wyatt out of an affair with Bill Spencer, Jr., but told Wyatt his father was dead until Wyatt's crush Hope Logan made the connection between Bill and Wyatt's sword necklaces; Quinn was forced to admit to a furious Wyatt that Bill had given her money for an abortion. After Quinn and Wyatt reconciled, Quinn was hired by Hope, who wanted to incorporate Quinn's jewelry designs into her Hope for the Future collection at design house Forrester Creations. Quinn overheard Hope's boyfriend, Liam Spencer, trying to kill the deal, so Quinn went to CEO Eric Forrester and kissed him after he agreed to honor her contract.

Knowing Wyatt had his eye on Hope, Quinn sent them to Mexico to retrieve a special blue diamond, then hacked into Liam's e-mail to send Hope the video tribute Liam had made for his ex-wife, Steffy Forrester. When Bill intervened on Liam's behalf, Quinn stuck Bill with his sword necklace and licked his blood off her finger. Later, Quinn prevented Liam and Hope's marriage by convincing Steffy, who had left Liam because she'd miscarried and become sterile, to inform Liam an operation had made it possible for Steffy to have children again.

Wanting to preserve Wyatt's romance with Hope, Quinn threatened Charlie Webber, a security guard who had footage of Wyatt pocketing the HFTF diamond and planting it on jewel thieves to impress Hope, then faked a friendship with Charlie's girlfriend, Pam Douglas, for the same reason. Quinn trapped Liam in an elevator in an unsuccessful attempt to suppress the truth. Quinn also groomed smitten young Aly Forrester to distract Liam from Hope; however, when Aly wanted to report Wyatt for stealing the diamond, Quinn held Aly over a second-story railing to ensure her silence.

Quinn decided she still had feelings for Bill and comforted him with a night of raucous S&M sex when Hope's mother, Brooke Logan, dumped him; Quinn was stashed in the closet by Bill when Brooke came over to make up. Having snapped a selfie in bed with Bill, Quinn showed it to Brooke's on-again-off-again love, Ridge Forrester, who tried to stop Brooke's wedding to Bill in Abu Dhabi and fell out Bill's helicopter into the Persian Gulf, sustaining brain damage. Quinn found herself public enemy number one at Forrester and lost her job in addition to alienating Wyatt.

When Quinn met Hope's ne'er-do-well father, Deacon Sharpe, in a bar, she offered him a place to stay if he would help push Hope and Wyatt together. Quinn then locked Liam in a sauna and poked him in the throat with his sword necklace; she was about to impale Liam with the real thing when Wyatt rushed in and stopped her. Quinn ran, then texted Wyatt that she had checked into a psychiatric hospital. With Hope about to marry Liam in Paris, Quinn followed and pushed his new friend, Ivy Forrester, into the River Seine knowing Liam would save her. Quinn's interference was exposed by Charlie, who unearthed security footage of Quinn shoving Ivy; Quinn was amused when Ivy broke into Quinn Artisan Jewelers and threatened Quinn with her own welding equipment.

Quinn pulled a gun on Deacon when he suspected her of killing Ricardo Montemayor, who had left the HFTF diamond to Wyatt. Aware that Deacon still had a thing for one-time lover Brooke and continuing to want Bill for herself, Quinn used Deacon in an attempt to come between Bill and Brooke but failed, falling into bed with Deacon afterwards. Later, Quinn became obsessed with Hope, who was expecting a baby with Wyatt; Quinn repeatedly insinuated herself into Hope's life to be a part of her grandchild, even donning scrubs and sneaking into the hospital for Hope's ultrasound. After Quinn broke into Eric's house to covertly attend Hope's baby shower, Quinn and Hope's heated discussion ended with Hope falling down a flight of stairs and losing her baby. Though Hope cleared Quinn of any wrongdoing, Quinn was blamed by everyone, including Bill, who tried to goad Quinn into jumping off a building.

Quinn tried to change her ways and supported Deacon helping fellow alcoholic Brooke, but soon slapped Brooke to the floor out of jealousy; Quinn was shocked when Deacon forgave her and proposed. Having been assured she wasn't Deacon's second choice, Quinn married him with only Wyatt in attendance until Hope "arrived" via Brooke's video call and tried to talk Deacon out of the nuptials. Later, Quinn encouraged the Australian Ivy to marry Liam because she didn't have legal immigration status; Quinn seemed happy with Deacon at Thanksgiving but soon told Wyatt they were separated.

Quinn came upon Liam in the Forrester parking lot and spirited him away to her cabin when he fainted in front of her, wanting to give Wyatt a chance to move in on Steffy after her broken engagement to Liam. Quinn learned from Ivy that the amnesiac Liam had hit his head during their flight to Australia; Quinn told Liam they were married couple "Adam" and "Eve" and began falling for him, sharing details about a long-ago miscarriage and a neglectful mother. Quinn had Deacon fake wedding photos to show Liam, but contemplated murdering Liam when Deacon warned Quinn she would be caught. However, after Deacon threatened to go to Bill, Quinn took Liam on a cliffside hike but made him go back to the car for asthma medication, deciding to push Deacon off the cliff instead.

Learning that Wyatt had seen security footage of her absconding with Liam, Quinn made plans to take Liam out of the country but was foiled by Wyatt, whose presence gave Liam total recall. Quinn found herself locked in a closet by them, only to be released by a vengeful Deacon, who had survived his fall. Quinn risked capture by asking Liam to give her another chance, but went to jail when Liam had her arrested; Quinn went free when her attorney told Liam it would be difficult to make any charges stick.

Quinn began a secret affair with Steffy's grandfather, Eric Forrester, and followed Eric to Monte Carlo; Quinn got smacked in the face by Steffy when she and Eric were caught together. Quinn felt Liam had taught her how to love and was even willing to lose Wyatt, who had sided with Eric's family and their vehement objections to their engagement. Meanwhile, trying to keep Liam away from Steffy, who had married Wyatt in Liam's absence, Quinn encouraged the returning Ivy to dress like Steffy and drop her Australian accent to snare Liam for herself. On Quinn's wedding day, Ivy was the only guest; Quinn was horrified when Eric collapsed from a brain hemorrhage while blasting his family for boycotting the ceremony. Quinn weathered accusations from all sides, especially from Ridge and Steffy, who learned that Quinn's marriage license hadn't been signed before Eric was hospitalized. But Quinn rose from the ashes when Wyatt learned that Ridge and Steffy knew Eric had given Quinn power of attorney and kept quiet about it.

At the behest of the recovering Eric, Quinn relieved Ridge and Steffy of their leadership duties at Forrester and announced that she had been made interim CEO. At her first fashion show, Quinn put a stronger focus on jewelry, then sidestepped Ridge's sabotage attempt by modeling the showstopper he tried to yank from the lineup. When Brooke's sister, Katie Logan, started hanging around Eric and bought a house next door, Quinn told Katie she didn't want Katie visiting her husband unattended. Infuriated to see Katie giving Eric a peck on the cheek, Quinn fantasized about murdering Katie with a candlestick, then advised Katie to stay away.

Quinn grudgingly attended a design symposium with Ridge in San Francisco, where she flamed him for trying to trap her into a compromising situation to destroy her marriage to Eric. The confrontation resulted in a kiss, which Quinn couldn't stop thinking about. Despite their sudden closeness arousing suspicion in Ridge's fiancée, Brooke, Quinn kept kissing Ridge and was snagged by Ivy, getting a slap in the face. Quinn accompanied Eric to Liam and Steffy's wedding in Australia, admitting to Ridge that she loved both him and Eric, and her goodbye kiss with Ridge was witnessed by Brooke. Quinn managed to talk Brooke out of telling Eric, but was forced to put Katie, who knew everything, on her jewelry design team. Quinn complained to Ridge and they kissed on his bed. Firing Katie for her lackluster designs, Quinn blanched when Katie picked up a gun and threatened her with it.

Quinn was shot at on her balcony; she was sure Katie was the shooter but it turned out to be a bitter, off-the-wagon Deacon. After Ridge rescued her, Quinn told Ridge she loved him. Quinn gained another adversary when Eric's notorious ex-wife, career criminal Sheila Carter, returned asking leading questions about Quinn's connection to Ridge. Quinn found herself thrown out by Eric after Sheila went to him with info about Quinn and Ridge's kisses; Quinn grew frustrated when Eric took off and no one would tell her where he was. Finally, Quinn sadly agreed to sign Eric's divorce papers, which left her nothing, and received a shock when Eric tore up the documents, declaring she had passed his test.

After Quinn and Eric reunited, Quinn got into an argument with Sheila, which led to a vicious catfight that ended with Quinn giving Sheila a concussion. Quinn balked when Eric wanted to let Sheila recuperate at the mansion; Quinn suspected Sheila was exaggerating her symptoms and walked in on Sheila moving around normally. Quinn dared Sheila to kill her during their second brawl, and Quinn demanding Sheila leave town led to a third battle. Finding out Wyatt had gotten involved with Katie, Quinn dragged Katie out of bed, then raged at Eric for not telling her he knew Wyatt and Katie were together. Quinn assured Eric she wasn't slipping back into her violent ways.

Quinn hurt her back and was relieved to learn that Mateo, the estate manager, was also a skilled masseur. When Mateo's hands wandered too far, Quinn had him fired, only to learn Sheila had bribed Mateo into coming between Quinn and Eric. Quinn had Eric pretend to want Sheila back, only to pull the rug out from under Sheila as payback. Quinn felt satisfied that she had won, but briefly worried that Sheila had let herself into the Forrester guest house.

Quinn boiled when she found out Bill had threatened to disown Wyatt over his engagement to Katie. When Bill was shot, Quinn found herself on a long list of suspects and was forced to go over how she had kidnapped the then-amnesiac Liam, admitting she wasn't proud of having committed that crime. Quinn argued with Brooke after Wyatt interrupted Liam's wedding to Hope with news that Bill had duped Liam into thinking Steffy and Bill were having a full-blown affair; Quinn was furious when Bill went through with cutting Wyatt off for ratting him out. Later, Quinn was not happy when Wyatt broke up with Katie and moved on with Sally Spectra, a fashion designer who had stolen from Forrester.

Quinn objected when Pam wanted to marry Charlie in the Forrester mansion under Stephanie's portrait, despite having let Brooke and Ridge do the same months earlier. On Eric's urging, Quinn reluctantly relented but enraged Pam with her cavalier attitude; the ensuing argument ended with Quinn's foot going through Stephanie's canvas. Later, Quinn bristled to find Eric's flirty ex-wife, Donna Logan, had moved back to Los Angeles; Quinn laid down the law to Donna but began to suspect that Pam was on a crusade to have Donna replace Quinn in Eric's life.

When Hope miscarried Liam's baby, Quinn joined Eric in supporting her. Later, Quinn was surprised to run into her old friend Shauna Fulton, whom she knew while living in Las Vegas; it was revealed that Quinn and Wyatt had left Vegas under the cover of night thanks to one of Quinn's shady business deals. Quinn had fond memories of Wyatt and Shauna's daughter, Florence Fulton, being high school sweethearts. Quinn was shocked when Flo tried to track down the father Shauna never talked about and discovered it was possible Bill had fathered Flo, which would have made Flo and Wyatt brother and sister. Quinn breathed a sigh of relief when it turned out Flo was the daughter of Storm Logan, Brooke's deceased brother. Quinn wanted Wyatt to be with Flo instead of Sally and made her opinion known in no uncertain terms; however, when Sally moved out on Wyatt after a blowout, Quinn genuinely felt for Sally.

With Eric's blessing, Quinn invited Shauna and Flo to stay at the Forrester mansion and looked forward to having her friend under her roof. Later, Quinn found out that Flo and Shauna had taken part in a cover-up started by obstetrician Reese Buckingham, who stole Hope's baby, switched it with a dead one, and used money from its adoption to pay gambling debts; while Eric and the family railed against the Fultons, Quinn wanted to give her Vegas friends the benefit of the doubt, but refused when Shauna begged Quinn to help her get Flo out of jail.

Later, Quinn seemed to have a change of heart and invited Shauna to stay in the Forrester guest house after the freed Flo needed time to recover from having donated a kidney to an ailing Katie. Quinn couldn't believe it when Shauna admitted she had kissed Ridge and relayed her own one-time fascination with him to Shauna. However, Quinn was less than thrilled to hear that Sally had taken Wyatt back and accepted his proposal.

Quinn fumed when, in front of her, Brooke slapped Shauna for kissing Ridge; Quinn struck back by smacking Brooke to the ground again and essentially declaring war on her after Brooke went to Eric and tried to get him to divorce Quinn. Remembering Brooke's alcoholic history, Quinn spiked her orange juice with vodka, but was advised by Ridge's son, Thomas Forrester, who disapproved of Ridge's marriage to Brooke, not to do it again because it would mean Ridge would run to Brooke's rescue. Quinn was intrigued when Thomas suggested they team up to get Brooke out of Ridge's life, but no plan between them ever materialized.

Quinn couldn't believe her luck when Shauna showed her a video of Brooke, who, while split from Ridge over their disagreement over whether Thomas was unstable and obsessed with Hope, kissed Bill. Although Shauna decided to delete the video, Quinn sent it to herself first and uploaded it to a digital picture frame Ridge had bought for a reunion party he was throwing with Brooke. After Brooke and Bill's kiss was exposed at the party, Quinn gleefully admitted her part in it and gloated to Brooke that Shauna was the better woman for Ridge. Quinn encouraged Ridge to go after Shauna, who was packing to move back to Las Vegas, and was thrilled when Shauna returned to L.A. as Ridge's wife.

Quinn continually rubbed the marriage in Brooke's face, telling Shauna to be quiet about how Quinn had gotten Shauna to send a fraudulent text filing Ridge and Brooke's divorce papers and lead Ridge to a wedding chapel. Since Ridge had been too drunk to remember his Vegas ceremony, Quinn pushed for a renewal ceremony but got hit with a double whammy when Shauna confessed everything to Ridge first and Eric overheard the extent of Quinn's scheme for himself. Quinn admitted she had wanted to get back at Brooke and reeled when Eric walked out on her. Quinn moved into a hotel, then accepted an invitation to bunk with Flo and Wyatt. Quinn was outraged when she learned that Shauna was staying at the Forrester mansion at Eric's behest; Quinn felt betrayed and didn't care that Shauna had been trying to get Eric to forgive Quinn, at least not until she overheard Shauna going to bat for her for herself. Quinn smoothed things over with Shauna and had a happy reunion with Eric, who decided to give Quinn another chance.

Quinn was overjoyed when Wyatt informed her that Flo had accepted his proposal; Quinn celebrated with Shauna. Hearing co-worker Zoe Buckingham blame her sister, Paris Buckingham, for the calling-off of Zoe's engagement to Carter Walton, Quinn encouraged Zoe to spike Paris' smoothie with digestive herbs Eric was taking that tended to cause loud gastrointestinal distress. Quinn agreed to talk to Carter on Zoe's behalf to help patch up their relationship, but ended up confiding in Carter about Eric's continuing refusal to make love to her. Quinn formed a bond with the understanding Carter, and, when Eric pushed Quinn away yet again, Quinn found herself in a passionate embrace with Carter, which led to a full-blown affair. Quinn hid under Carter's bed when Zoe came by unexpectedly, but when Zoe saw the jacket that Quinn had left on Carter's floor at the office, Quinn sweated bullets until Shauna stepped in and announced she was the one sleeping with Carter.

Quinn thrilled when Eric wanted to recommit to their marriage and happily planned a vow renewal ceremony to celebrate it. But Quinn found herself booted out when Brooke confronted Carter at the gathering and got him to confess to his affair with Quinn. Quinn and Carter continued to see each other on the sly and had just exchanged "I love you"s when Quinn was rocked by Eric's decision to rip up his divorce papers. Quinn mourned losing Carter but went back to Eric and soon learned Eric had initially pushed her away because he was struggling with erectile dysfunction. Quinn vowed to stay by Eric's side and get him the medical help he needed, but balked when Eric suggested that Quinn get her sexual needs met with Carter. Quinn did eventually agree to an open marriage, only to get caught by Justin Barber, who was following Quinn on Ridge's behalf. Quinn desperately tried to explain to Eric's disapproving family that Eric himself had sanctioned the extramarital activity because of his ED. After Eric thought better of it and asked Quinn to end things with Carter, Quinn was shocked to learn that Carter wanted to run away with her and gently rebuffed her lover, opting to stay with Eric.

Quinn fumed when she learned that Eric could become aroused around ex-wife Donna, but not her. Quinn threatened Donna and demanded that Eric fire her. But Quinn had a moment of clarity when she realized that she may be the problem in her marriage, which caused Eric to devote himself to Quinn again. Months later, Quinn returned Carter's key to him and admitted that, while things were going fine in her marriage to Eric, Quinn missed Carter's friendship, as she didn't have many friends.

Quinn was dismayed when Eric seemed to be keeping his distance from her, which included spending an inordinate amount of time at a country club playing a game called "pickleball". Wanting to ensure Eric's health, Quinn gave him a smart ring that would monitor his heart rate, but didn't tell Eric that it contained that technology. Concerned when the ring indicated a spike in Eric's pulse, Quinn brought Eric's doctor daughter, Bridget Forrester, to the club and found Eric in bed with Donna. After an amicable split from Eric, Quinn wound up hurriedly riding a bicycle to stop Carter's wedding to Zoe's sister, Paris Buckingham. Quinn and Carter reveled in their reunion after Carter left Paris at the altar, despite some niggling resentment toward Eric over choosing Donna.

Quinn then disappeared from the canvas, and it was later revealed that Quinn had moved out on Carter because he wanted a family and Quinn had already raised a son.