|Born:||16 November 1981|
Channel Ten publicity describe Oliver branding him as "Honest, forthright and fun-loving", stating he is "free-spirited and big-hearted" compared to his brother Sebastian adding that he has "genuine sentiment".They comment that he is good looking and has serious charm. Oliver also has a manipulative side which was portrayed in his storyline with Elle Robinson when they con Paul Robinson out of ownership of his business. and Lauren finally leaves with a bang
Oliver Barnes grew up as the son of Pamela and Clifford Barnes and the brother of Sebastian Barnes. When Pamela and Clifford died, Oliver was to become the heir to the Barnes family empire, but he turned his back on the fortune and travelled the world instead. Oliver allowed his brother to inherit the family business and Sebastian used Oliver's story to create an alter ego, Will Griggs, when he arrived in Erinsborough
Oliver arrives in Erinsborough after finding out about his brother's lies and he explains to Carmella that Sebastian has lied to everyone. Oliver and Carmella Cammeniti grow closer and they begin a relationship, but Paul believes that Oliver would be a better match for his daughter Elle. Paul blackmails Ned Parker into helping him split Oliver and Carmella up, but Ned's plan doesn't work after Oliver stays with Carmella. When Carmella is asked to take over her family business to save it from being run into the ground by her Uncle, Ray. Oliver tries to help her financially, but is told that he cannot get his inheritance. Carmella eventually comes up with the money and the couple set up a fruit and vegetable business. When Carmella realises that her Uncle hasn't forgiven her for giving away his daughter's child, the business soon runs into trouble. Carmella realises that she has to play Ray at his own game and Oliver grows uncomfortable when he witnesses Carmella's ruthless streak. Paul and Elle take a chance to make more trouble and decide to force Carmella and Oliver apart. They plant a bomb in Carmella's delivery van, making it look like Ray has done it, but the bomb detonates at the wrong time nearly killing Oliver and Carmella. When Carmella confronts Ray, he has a heart attack and Oliver, who witnesses the scene, breaks up Carmella. When Ned tells Elle about being blackmailed by Paul, Elle and Oliver decide to bring him down. Paul is very happy when Oliver finally manages to sign documents entitling him to his inheritance, but during the document signing, Alan Napier, an assistant to the Barnes family, suddenly collapses. At the hospital, Alan falls into a coma and as Oliver waits for news, he and Elle decide to continue with their plan and announce their engagement. Paul believes that he will now have access to Oliver's inheritance and sells Oliver his shares in Lassiters to be able to get Janelle Timmins half. Elle and Oliver then publicly declare that they now have full control of the company and Paul is left with nothing. Oliver then begins a relationship with Elle.
Meanwhile, Alan Napier comes out of his coma and tells Oliver that he is his Grandfather and Oliver is adopted. Oliver then tries to track down Alan's children to find out which one is his real parent. Marcus Napier denies being Oliver's father and tells Oliver that his sister Rebecca Napier is Oliver's mother. Oliver gets Rebecca's number and they arrange to meet, but she cancels at the last minute. However, when Rebecca hears that Oliver has been involved in an accident, she comes to visit him and things begin well until Rebecca announces that Paul is Oliver's father. Another DNA test is taken and proves that Paul is not Oliver father. Oliver confronts Rebecca and when he sees Declan he reveals who he is. Oliver then asks Rebecca who his father is and she tells him that his real father had been a violent man who she split up with after Oliver’s conception, but she later reunited with him and he raped her, resulting in Declan. Elle finds out Oliver's father's name is Richard Aaronow and Oliver goes to meet him after doubting Rebecca's story about the type of man he is. Shortly after the meeting with Richard, Carmella reveals to Oliver that she is pregnant with his child. Oliver is delighted, but Elle isn't so happy and their relationship ends. When Richard follows and confronts Rebecca at a picnic, she knocks him unconscious and he is taken to the hospital where they are informed that Richard is dying from kidney failure and only has weeks to live. Oliver decides to donate his kidney, so he can keep Richard alive long enough to give Rebecca justice in court. Oliver survives the transplant operation, but Richard's health deteriorats and he later dies.
Oliver's attentions then turned back to his unborn child and is unhappy with Carmella's new relationship with Marco Silvani. When Carmella goes into labour, both Oliver and Marco are there to witness the birth of Oliver's daughter, Chloe. Oliver then becomes attracted to Marco's sister, Mia and they begin a short relationship. After breaking up with Mia, Oliver rekindles his relationship with Elle, despite her apprehensions. A few weeks later, Oliver is caught up in the bushfire that sweeps through Carmella and Marco's engagement party. Oliver manages to get to safety with some of the other neighbours, but Marco disappears after going to get Carmella's ring. At the hospital, Oliver thanks Marco for helping to save his daughter and Marco asks Oliver to be his best man as he and Carmella are going to get married at the hospital. Marco dies shortly after he marries Carmella. Oliver is then offered a job abroad and he decides to accept and asks Carmella and Chloe to join him. However, Carmella turns him down as it's too soon after Marco's death. Carmella and Chloe later decide to join Oliver in Portugal and they send a video message to Rebecca telling her how they're doing.
Declan calls Oliver when Paul begins to make Rebecca's life difficult after she leaves him and Oliver, Carmella and Chloe arrive in Erinsborough. Oliver goes to see Paul and warns him to stay away from his family. He then tells Rebecca that they have come to take her back with them. When Rebecca tells him that she is staying with Michael, Oliver appeals to him and explains that Rebecca needs to leave Erinsborough. Rebecca changes her mind and the family leave.