Little teasers have slipped out over the years - we know that he was an Olympic-level swimmer and has an estranged charity-worker son - but pretty darn important things like his name and face are still to be revealed.
What viewers are certain of, though, is The Banker's mean streak. He's dastardly, devious and takes great pleasure in smashing the dreams of contestants. But surely somebody who's dished out over £26m in prize money over the years can't be all bad?
As Deal or No Deal prepares to go live for the first time, Digital Spy set out on a mission to expose The Banker's soft side - and instead was threatened, abused and left with the horrific mental image of Noel Edmonds' "tight little body":
So Mr Banker, what made you decide that now was the time for Deal or No Deal to go live?
"Well, normally an episode of Deal or No Deal can take over two hours to film. But if we are live, then I start at 4pm and am done by 5pm. Still getting the same daily rate. It's like an instant pay rise."
Do you think this will impact the way contestants play the game?
"Certainly. They'll have to make big money decisions incredibly quickly instead of bleating on endlessly about how they have had such a tough life since they fell off a bar stool at the bingo."
Can we expect any other twists or surprises during the live shows?
"Maybe. I might play sober for instance. Although it's unlikely."
This might be a ridiculous notion, but are you scared that you could mess up when you go live? How are the nerves?
"Not worried. I rarely mess up; except perhaps after spicy food or during an exceptionally violent sneeze."
The last time you mixed up the game on your birthday, you had to give away another £250,000 - are you concerned that lightning could strike twice this fortnight?
"Listen chum, any more questions like that and I might send a spy round to pay you a little visit. And not a digital one."
"No. But I've a feeling yours might be."
What has been your favourite moment from six years of Deal?
"When the studio flooded in a heavy rainstorm and for one brief, glorious moment, I thought everyone might drown."
Deal or No Deal's been going for almost six years and over 1,700 shows - did you ever image that it would become this popular?
"Only an egomaniac would say yes. So, yes. I'm guessing Noel would say yes also."
Speaking of Noel, your relationship with him has become somewhat strained over the last six years… time to tell the truth, what's your honest opinion of the bearded one?
"I think that for an old bloke, he's got a tight little body."
Having dished out millions of pounds since the show started, do you think the time may come when you've had enough of Deal?
"Over £26 million dished out, it's true. But think of what I get in return: tears, broken hearts and lost dreams. Plus advertising revenue."
Are you a bit disheartened by your villain status? I bet you're a right softie behind closed doors...
"I'm cold and hard on the outside, and maybe, maybe, a little bit softer on the inside. But I'm still cold on the inside. If you think about it, I'm like a Magnum."
Everyone knows you love to make a saving, but are there any particular players whose nightmare games have left you with the tiniest twinge of remorse?
"Pahahahahahahahahaha! AS IF! Next question."
What attributes do you most fear and respect in a player?
"Being determined, being courageous and being armed."
There were a record number of people applying to battle you in the dream factory this year - what can people do or say to convince you that they are a worthy adversary?
"That they will respect the game, that they will play with passion and that they don't mind going on a date with me if I think they're fit."
We've seen hints of your quick wit on the show, but frankly it's not been enough. How about you leave us with your favourite joke?
"The worst time to have a heart attack is during a game of charades."
Deal or No Deal live begins Monday at 4pm on Channel 4
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