D.I. Banks is a detective who has investigated several incidents in Hollyoaks.
In August 2013, D.S. Banks interviewed Nancy Osborne after she crashed her car at the top of a multi-storey carpark, nearly killing herself, nephew Charlie Dean and son Oscar Osborne. Nancy had been framed for kidnapping Charlie and Oscar by estranged husband Darren Osborne's girlfriend Sienna Blake, and was deemed mentally unstable. In September 2013, D.S. Banks questioned Joe Roscoe over a severe beating his uncle Ken received. In March 2014, D.S. Banks was part of the search for the missing Rose Lomax. In March 2016, D.S. Banks questioned Cleo McQueen and Holly Cunningham over a car accident which resulted in the death of Rachel Hardy.
In May 2019, D.S. Banks spoke with Farrah Maalik after her girlfriend Grace Black was struck by a car in a hit-and-run and interviewed Romeo Quinn in June 2019 when his alibi for Harry Thompson was proved to be unreliable. D.S. Banks informed Ste Hay and Jonny Baxter were removing their permit to protest on Oakdale Drive due to the vandalism of Price Slice later in the month, and continued to investigate them and Stuart Sumner for suspected far-right extremism activity.
In August 2019, Scott Drinkwell and Darren Osborne spoke with D.S. Banks to report Tony Hutchinson as missing, but he refused to investigate. In February 2022, D.S. Banks investigated the disappearance of Maya Harkwell when she was reported as a missing person. In June 2023, D.S. Banks was called out with armed units to a robbery on a money van at the Royal Northern Bank depot, arresting Grace Black, Cindy Cunningham and Zara Morgan. Grace confessed to the crime but claimed to have acted alone, with the others corroborating her story. In September 2023, D.S. Banks questioned Sienna over £10,000 taken from Rafe Harcourt's bank account, but failed to get far with the appalled Sienna as solicitor James Nightingale managed to get her quickly released.
In March 2024 D.I. Banks is seen attempting to catch escaped convict Romeo Nightingale who escaped from hospital with the help of Peri and James. D.I. Banks questions both Peri and James but because of lack of evidence he's unable to charge them both in helping Romeo escape.
In May 2024 D.I. Banks arrested Carter Shepherd during Pride week on suspicion of blackmail, kidnapping and attempting to abduct Lucas Hay.
In June 2024, D.I. Banks entered Hannah Ashworth's hotel room, thinking that Robbie Roscoe was a punter and that Hannah was about to scam him, as Banks had received numerous reports about stolen wallets from the same hotel room. D.I. Banks arrests Hannah on suspicion of theft and questions her. Hannah still denies stealing any wallets and is being closely watched by Banks.
In July 2024, Zoe Anderson shared her concerns with D.I. Banks regarding the Kitty Draper missing person's case. She thinks that Ivy Shaw killed the real Kitty Draper and got rid of the body as she heard Beau Ramsey talk about what they've buried in Hunter McQueen's grave. She requests for Hunter's grave to be exhumed. After Beau Ramsey admitted that he murdered Declan Hawthorne and that the body is buried in Hunter's grave, the police exhume the grave. D.I. Banks asks Zoe to bring him Beau so that they can question him. During the questioning, D.I. Banks did not buy Beau's story as to how he knew where Declan's cottage was and tells him that the police will find his accomplice. D.I. Banks then leads Beau to his prison cell.
In August 2024, D.I. Banks informs Zoe Anderson during a staff leaving party at The Loft that the person making the missing person's report for Kitty Draper is Abe Fielding. He also leads the investigation of the murder of Norma Crow and later arrests her son Warren Fox after finding the gun with the bullets that killed Norma. However Warren was set up by both Dave Williams (the real killer of Norma) and his associate Rex Gallagher. He tells Mercedes McQueen that Warren has been charged with murder.
In November 2025, D.I. Banks informed Nancy and Jack Osborne that they found Darren's phone and wallet inside a stolen car at a remote location close by to a beauty spot. Nancy tells D.I. Banks that Darren has a history with depression. In January 2026 D.I. Banks arrests Abe Fielding over the suspicion of rape of Peri Lomax but after Banks interviewed Abe he was let go.