Rob O'Connor is the father of Sinead, Finn and Olivia O'Connor, the boyfriend of Kath and the ex-husband of Diane Hutchinson. He arrived with his family in September 2010, Rob departed In January 2011 but returned for a guest appearance two years later on 15th April 2013.
Rob and the O'Connor family move to Hollyoaks due to his new job as deputy headmaster, However, soon after, his daughter Sinead O'Connor knocks the headteacher unconscious with the water bucket trick, Rob is promoted to acting head.
Amber Sharpe becomes pregnant by his son Finn O'Connor, but starts to write in her diary saying that Rob is the father. Amber kisses Rob, which is seen by Eva Strong. Eva then steals Amber's diary and threatens to blackmail him with it. Feeling sorry for Rob, Eva's daughter Anita Roy decides to give him the diary so he can dispose of it, but Anita is unaware that Eva had taken out the important pages. Anita takes Rob back to her flat to try find the missing pages, Eva returns home and finds Rob alone in the flat with Anita, Eva then calls the police and has Rob arrested. Sinead is devastated that he is arrested, and Diane informs Sinead that Rob started seeing her when she was his student. Diane also tells her that Sinead and Finn's real mother Morag Fairhurst is still alive, Sinead is furious with Rob for not telling her. Diane and Rob decide to split up and Rob plans to take Sinead and Finn away with him, but Sinead decides to stay with Diane, so Rob leaves on his own, Finn later goes to live with him.
In April 2013, Rob returns to Hollyoaks and reveals to Diane that Finn has run away from home and asks her if he has been in touch with her and Sinead. It is also revealed by Sinead and Finn, that Rob's girlfriend is called Kath, and that they have a daughter together recently born called Olivia.