Birth name is Liam Cooper
Presumably still controls 12.5% of Forrester Creations stock owned by Bill Spencer
Former acting CEO of Spencer Publications
Former president of Spencer Publications
Former vice president of Forrester Creations
Former vice president of Spencer Publications
Former editor of Eye on Fashion
Interned as an IT guy as Spencer Publications
Former computer repair technician
The Dakota Motel, Los Angeles, CA
Formerly Bill Spencer's cliff house, Malibu, CA
Formerly Quinn Fuller's cabin in Topanga Canyon, CA
Steffy Forrester [Married: 2011; divorced: 2012; first time]
Hope Logan [Married: 2012; never legalized: 2012]
Steffy Forrester [Married: 2013; annulled: 2013; second time]
Ivy Forrester [Married: 2015; annulled: 2015]
Bill Spencer, Jr. (father)
Kelly Cooper (mother; deceased)
Bill Spencer, Sr. (grandfather; deceased)
Karen Spencer (half-aunt)
Caroline Spencer Forrester (half-aunt; deceased)
Caroline Spencer (half-cousin)
Douglas Forrester (half first cousin, once removed)
unnamed child (miscarriage; with Steffy; 2013)
Quinn Fuller (while amnesiac)
Kissed Steffy Forrester while engaged to Hope Logan 
Tore up Steffy's annulment papers and kept it a secret from fiancée Hope Logan 
Kissed Steffy on day of wedding to Hope Logan 
Punched Rick Forrester 
Kissed Hope Logan while committed to Steffy Forrester 
Punched Wyatt Spencer [2013, 2014]
Drove off with Wyatt Fuller's camper 
Shoved Rick Forrester to the ground 
Kissed Steffy Forrester despite her being married to Wyatt Spencer 
Covered up the crime of Steffy shooting Sheila Carter 
Blackmailed Bill Spencer into giving him control of Spencer Publications 
Punched by Ridge Forrester 
Slapped by Stephanie Forrester 
Suffered a concussion after tripping and hitting his head 
Hospitalized with a concussion following an explosion in Tawny's trailer 
Trapped in a steam room by Quinn Fuller 
Punched by Wyatt Fuller 
Stabbed in the throat with his sword necklace by Quinn Fuller 
Sprained his ankle after being spooked by Quinn Fuller 
Kicked in his sprained ankle by Quinn Fuller 
Attacked by Quinn Fuller and nearly impaled through the heart with a sword 
Knocked himself unconscious in an airplane lavatory 
Fainted from dizzy spells, hitting his head and becoming amnesiac 
Punched by Bill Spencer 
Caught in the demolition of Spectra Fashions and trapped in its wreckage 
Kissed Sally Spectra while married to Steffy Forrester 
Sustained minor injuries and irritation from breathing rubble dust 
Lacerated his hand crushing his sword necklace 
Computer tech Liam Cooper arrived in Los Angeles following the death of his mother, Kelly Cooper, who said he could find his father at design house Forrester Creations. Both Thorne Forrester and publishing magnate Bill Spencer, Jr. had dated Kelly, so they submitted to a DNA test; Liam chafed when the more aggressive Bill turned out to be his father. Liam made the adjustment with the help of Hope Logan, which led to a sweet romance, during which Liam fended off the advances of Hope's rival, Steffy Forrester.
After a misunderstanding with Hope, Liam got drunk at a party and hit his head, waking up next to Amber Moore, who soon claimed she was carrying Liam's baby. Liam and Hope went through a dizzying array of breakups and makeups trying to decide what was best for the child, and Liam faced competition from Hope's ex-boyfriend, Oliver Jones. Liam suffered a concussion in an explosion caused by Amber's pilot light; months later, Liam realized he'd been duped when Amber gave birth to an African-American baby, barely stopping Hope from accepting Oliver's marriage proposal.
When Hope wanted to stay a virgin until her wedding night, Liam became frustrated and publicly proposed to Hope during a showing for her Hope for the Future fashion collection. Liam saved Steffy, who fell in her bathtub and nearly drowned; Liam resisted when Steffy became amorous and let him know she was sexually available. After Liam kissed Steffy and came home to find Hope's engagement ring on his mantel, Liam gave the ring to Steffy and took her to Aspen, exchanging vows with her there during a surprise wedding.
Liam later found out that Hope had seen him kissing Steffy but followed him to Aspen to make things right, only to be locked in a gondola by a disapproving Bill and forced to watch Liam's wedding. Liam wanted to return to Hope but felt obligated to stay with Steffy, who was suffering from a life-threatening blood clot as the result of being thrown from an ATV in Cabo San Lucas. Though Liam forgave Steffy for conspiring with Bill in Aspen, Liam raged upon learning Bill had faked Steffy's MRI to manipulate him into staying with Steffy. Liam asked Steffy for an annulment and was about to marry Hope until Steffy announced she wanted to hold out for a proper divorce.
Liam moved Hope in with him, but was concerned when she became increasingly erratic after freezing up in bed. Liam saved Hope from drowning in the Forrester pool, upset to find she'd been taking excessive doses of antianxiety pills so she could make love to him. After Hope crashed into Steffy on the slopes of Aspen, the furious Liam tended to Steffy and tore up the annulment papers she'd finally agreed to sign.
About to marry Hope in Puglia, Italy, Liam found a note from the absent Hope which declared she couldn't go through with it. Liam professed his love to Steffy, relenting when Hope explained she had been delayed by the sudden appearance of her estranged father, Deacon Sharpe. Liam finally married Hope, but after she saw a video of him kissing Steffy he'd accidentally taken with his iPad, Liam agreed to give Hope a "do-over" wedding. But Liam partied with Steffy the night before and showed up for Hope's ceremony with dyed hair and a temporary tattoo, so Liam found himself single again, soon finding his way back to Steffy.
Liam raged to learn that Hope's brother, Rick Forrester, had told Hope that Liam kissed Steffy before the do-over, and that Bill broke Deacon out of jail to ruin the Puglia wedding. Liam punched Rick and disowned Bill, relenting when Bill stabbed himself with his sword necklace; Liam didn't know Bill cushioned the blow with his money pouch. When Hope wanted Liam back, Liam asked for time to think but walked into a surprise wedding that Steffy interrupted with news she was pregnant. Liam married Steffy instead in a unique ceremony where she roared down the aisle on a motorcycle; Liam asked Steffy to stop riding until after the baby was born and was inconsolable when Steffy had an accident and miscarried. Liam questioned why Steffy suddenly moved to Paris until he followed her there and learned that the accident had left her barren.
Liam tentatively moved on with Hope, who was also seeing Wyatt Fuller. Liam was shocked to learn that Wyatt was his half-brother through a fling Bill once had with Quinn Fuller, but that didn't stop Liam from punching Wyatt for kissing Hope. Liam scrambled to explain when Hope saw a video tribute Liam made for Steffy, realizing Quinn had hacked into his e-mail in an attempt to push Hope toward Wyatt. Getting Hope down the aisle, Liam was surprised when Steffy arrived, telling him she could have children again thanks to a procedure she had done overseas. Liam wished Steffy well but had to follow Hope to Hawaii when she ran off with Wyatt; though Liam explained Quinn had convinced Steffy to see him, Liam flew home alone.
When Liam found security footage that showed Wyatt pocketing the rare "Hope for the Future" diamond he said he'd rescued from jewel thieves, Liam crashed Hope's camping trip with Wyatt and exposed him, but only after he managed to escape being trapped in an elevator by Quinn. Liam cringed when he came upon houseguest Bill having raucous S&M sex with Quinn. Later, after hearing about Hope's pregnancy scare, Liam lured Hope into Wyatt's camper and drove off, trying to convince Hope to date both of them. Having been locked in the Forrester steam room by Quinn, Liam won Hope when Wyatt socked him for calling Quinn an evil bitch.
Liam barely survived when Quinn stabbed him with his sword necklace, then tried to impale him with the real thing. Though Liam was grateful to Wyatt for saving him, their brief truce ended when Wyatt presented Hope with the HFTF diamond at a press conference. Liam walked out on Hope, but agreed to meet her in Paris to get married under the Eiffel Tower. En route, Liam was delayed saving jewelry designer Ivy Forrester, who had fallen into the River Seine. After Hope married Wyatt instead, Liam learned Quinn had pushed Ivy into the Seine on purpose, but Hope decided to stay with Wyatt because she was carrying his baby, so Liam moved on with Ivy during a romantic trip to Amsterdam and talked to Ivy's father, John Forrester, about his intentions. Liam found the pregnant Hope at the bottom of a staircase after she argued with the obsessive Quinn; Liam and Hope admitted they'd always love each other after Hope miscarried and decided to move to Milan.
Enraged that new Forrester CEO Rick was tormenting Ivy, Liam devised a takeover plot involving his father's 12.5% stake in the company, but Steffy would only contribute her 25% if Liam came back to her. Instead, Liam worked with Wyatt and found out that Rick's mistress, Maya Avant, was transgender; Liam and Wyatt were aghast when Bill published an exposé on Maya over the brothers' objections. Liam became vice president of Forrester when his plan to combine Bill's stock with that of Steffy's family was successful.
Just as Liam's feelings for Steffy resurfaced, Liam agreed to marry the Australian Ivy, who was facing deportation, in name only. Though Ivy's cousin, Aly Forrester, who had a history of mental illness stemming from the traumatic death of her mother in childhood, died in a violent confrontation with Steffy, Liam dumped Ivy at Aly's memorial. Liam defended Steffy against Ivy, who was trying to blackmail Steffy with a video that made it seem Steffy had killed Aly. After Liam brokered a truce between the feuding cousins, Liam stumbled upon information that his own cousin, Caroline Spencer, was not carrying the child of her husband, Ridge Forrester, but Liam agreed to keep quiet.
Liam withdrew from Steffy as she insisted on telling Wyatt that new girlfriend Ivy was kissing her brother, Thomas Forrester, behind Wyatt's back; though Liam had rebuffed Ivy's attempt at a reconciliation, Liam walked out on Steffy after her battles with Ivy left Ivy electrocuted and suffering from a concussion. Liam suffered his own concussion when he escorted the departing Ivy onto her plane and hit his head in its lavatory; when Liam came home dizzy from his inadvertent flight to Australia, he found Steffy cuddling in bed with Wyatt and broke off his engagement to her without explaining why.
Collapsing in the Forrester parking lot and sustaining another head injury, an amnesiac Liam woke up in a cabin to find Quinn taking care of him. Believing Quinn's story that they were married couple Adam and Eve, Liam made love to Quinn and told her he loved her as she confided in him about her neglectful mother and once losing a child. Still combating nausea, dizziness, and headaches, Liam answered Quinn's phone, not recognizing Steffy's voice on the other end. Though happy with "Eve," Liam wanted to know more about their life together, finding answers in a photo album that displayed doctored wedding photos.
Growing increasingly frustrated about his impaired memory, Liam began having memory flashes of Steffy. Just as Liam was about to travel the world with Quinn, Wyatt rushed in, which gave Liam total recall. Liam escaped when Wyatt helped him lock Quinn in a closet, but Liam was stunned to learn that Steffy had married Wyatt in his absence. Liam had Quinn arrested, but dropped the charges when Quinn's attorney reminded Liam his sexual relations with Quinn had been consensual and that it would be nearly impossible to make his case stick.
Liam subdued an intruder in his home thinking it was Quinn, but it turned out to be the reverend who married Wyatt and Steffy. Liam was sure the reverend was a fraud until Bill confirmed his legitimacy; when Liam refused to give up on Steffy, Bill's threat to cut him off from the family forced him to respect Steffy's marriage. Liam admired Bill's commitment to his own wife, Katie Logan, until Liam discovered the secret love nest Bill was sharing with Katie's sister, Brooke Logan. Liam blasted his father and then turned his attention toward Steffy, who was having a hard time keeping Quinn away from her. Liam was as horrified as Steffy when Quinn romanced Steffy's grandfather, Eric Forrester, yet Liam remained hopeful that Quinn's constant presence would send Steffy running back to him.
Liam was intrigued when Ivy came back from Australia sporting sexier clothes, an American accent, and a new boldness that resulted in Liam receiving a kiss from Ivy. But when Steffy left Wyatt over refusing to keep secret the fact that Quinn held new husband Eric's power of attorney while he was hospitalized following a brain hemorrhage, Liam happily took Steffy back. However, when Eric and Quinn wanted to make Steffy CEO of Forrester, Liam warned Steffy it was a ploy to push her and Wyatt back together; Liam also cautioned Katie about Quinn's true colors when Katie remarked that buying a house next to Eric seemed to make Quinn irrationally jealous.
Liam felt encouraged when Ridge confided that he had a plan to get rid of Quinn, but was confused when Ridge later abandoned it. Frustrated by Eric and Quinn's ploy to reunite Steffy and Wyatt, Liam got tired of waiting for Steffy to tell Wyatt to back off and headed for the airport, where he learned from Steffy that Wyatt had fast-tracked their divorce. After Liam and Steffy became engaged, Liam was intrigued by Ivy's suggestion that they marry in Australia in a double wedding with Ridge and Brooke. Liam couldn't believe it when Steffy zip-lined into their ceremony in front of the Sydney Opera House and stayed behind with Steffy Down Under for their honeymoon.
When Forrester's old rival, Spectra Fashions, revived and stole Forrester designs, Liam figured out that the bad review Spencer Publications had published about designer Sally Spectra's original work had actually been written by Bill, who wanted to bulldoze Spectra to put up another skyscraper. Liam told Steffy, who disapproved of Sally and her relationship with her brother, Thomas, but Liam was happy that Steffy chose to be truthful with Thomas, even after Liam's revelation caused Thomas to invest $100,000 in Spectra to save it from the wrecking ball. After Thomas became Spectra's lead designer, Liam encouraged Steffy to ease up on Sally, sure Sally wasn't simply using Thomas to upgrade Spectra.
After learning that Eric had left Quinn after an argument and taken off with his former wife, notorious attempted murderer Sheila Carter, Liam used his IT skills to trace Eric's phone and was stunned when Steffy brought a gun for protection. Having been told by Quinn that Sheila probably had a gun in her purse, Liam shouted out when Sheila seemingly reached for it, prompting Steffy to shoot Sheila. Liam helped cover up the crime when it turned out the bullet had only grazed Sheila's arm, then promised Eric not to tell anyone else where he was staying.
Liam was aghast when he learned from Sally that Thomas had left town to spend time with a dying Caroline and their son, Douglas Forrester. Sensing something was off, Liam put the pieces together and discovered that Bill had lied about Caroline having a terminal illness to get Thomas out of the way so Spectra would fail and Bill could replace it with a skyscraper. Although it shook Liam that Bill threatened him with disownment if he told anybody, Liam apprised Steffy and was stunned when she felt they should go along with the deception. Liam interviewed Sally for a Spencer publication and found her new work promising, refusing Bill's demand to trash the new collection in a review. Liam put out a small electrical fire at Spectra caused by a faulty outlet, then reeled when Spectra burned to the ground. Liam couldn't believe that Bill actually confessed to arranging the fire and menaced Liam into keeping quiet; Liam agonized over whether or not to go to the police.
Finally, Liam recorded Bill making a second confession about the fire and threatened to play it for the cops if Bill didn't step down as CEO of Spencer Publications. Undeterred after Bill retaliated by punching Liam in the face, Liam bought the burned-out Spectra Fashions and gave it to a grateful Sally. Liam stood his ground with Bill and rejected Steffy's attempts to heal the rift between them, causing a rift of their own. Confronted by Wyatt, Liam offered his brother a spot running Spencer alongside him; it gave Liam pause when Wyatt warned that Bill would surely exact revenge. Liam reluctantly returned the CEO seat to Bill when his father found a way to delete his recording but thrilled when Bill asked for his forgiveness and installed him and Wyatt to run the company with Bill.
However, when Liam learned Bill had arranged that power structure so Bill and Wyatt could vote against Liam to demolish Spectra in favor of Bill's skyscraper, Liam arranged a sit-in with the Spectras on the day the fashion house was scheduled to be flattened. After Sally's co-workers ran scared, Liam went back in with Sally and was caught in the destruction of Spectra, becoming trapped in its wreckage. Unable to move and afraid he would die, Liam let Sally kiss him. Liam was rescued by Bill and Steffy; Liam refused to forgive Bill and felt he should be honest with Steffy about kissing Sally. Liam worried when a disgusted Steffy bolted but arranged to renew his vows with her after she came home; Liam also felt he had taken too hard a line with Bill and continually apologized for the rift between them.
Liam felt a few things didn't add up between the night Steffy walked out on him and her behavior since, but he promptly forgot about it when he learned that Steffy was expecting his baby. However, when Liam discovered paternity test results and Steffy admitted she had slept with Bill, Liam left both Steffy and his job at Spencer Publications. Liam appreciated the support of Sally and the newly returned Hope, yet found himself besieged by well-meaning family members exhorting him to forgive Steffy for the sake of their unborn child. But Liam couldn't and presented Steffy with annulment papers, suggesting she and Bill were a better fit for each other.