Walker made his first appearance on the Channel 4 soap last month and he will return to screens in a few days' time, causing Cheryl Brady to fear that her brother Brendan is up to no good again.
Brendan (Emmett Scanlan) and Walker previously spent time in prison together, now sharing both a rivalry and a mutual respect.
Newbon told Inside Soap of Walker's future: "I'm so excited about what's in store. Walker is a very unusual character for Hollyoaks, and his story is going to be quite revolutionary."
He continued: "It's something the audience won't have seen before."
Offering his take on Brendan and Walker's sparring, Newbon added: "They have a volatile dynamic because they're so similar in many ways. Walker thinks Brendan is far and away the most impressive person he's ever come up against, and has a lot of respect for him.
"They're always working in parallel, whether it's together or against one another. They are each other's shadows."
As seen in the latest Hollyoaks picture preview, Joel Dexter (Andrew Still) will soon decide to do some detective work by finding out more about Walker.
Beyond that, magazine reports have revealed that Lynsey Nolan (Karen Hassan) will also become curious about Walker, doing some digging of her own when she realises that there may be a mystery connection between him and Amy Barnes's Australian boyfriend Ally (Dan O'Connor).
Hollyoaks airs weeknights at 6.30pm on Channel 4, with a first look screening at 7pm on E4.