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Mug the Gargoyle: Doom
Olaf: Lost Vikings

(Ha, I had the same thoughts for Manic Miner and Doom!)

Can't believe no-one suggested...

Lissard - Pong

I'd like to see Owen, Smirkenorff and Bhal-Shebah indulge in a game of Dungeons & Dragons.

Or maybe even witness Ridolfo strum it up on Guitar Hero.

Then you have Mogdred, Morghanna and Lord Fear doing their thing on Resident Evil, after which they would pit their own wits against each other on Killer Instinct. (Personally, I think Morghanna would win the latter, seeing as her only two appearances on Knightmare resulted in the dungeoneer being vanquished in the same room.)

Lord Fear playing Evil Genius. And then using it as inspiration for constructing a steampunk themed Frickin' Lazar.

I wrote:Mr. Grimwold - Pac-Man

Or this.