adaliabooks: Crimson Shroud on DS is what you're looking for.
The characters are models (with bases and everything) and as far as I remember the scenery is diorama like. You roll dices and it plays out like a pen and paper RPG.
It's a bit short, but a good game anyway.
And that diorama is pretty awesome. Reminds me of the battlefields they used to use at GWs Gamesday for playing the big Warhammer battles on.
3DS, actually. :D I looked it up since it seemed fun (a pen and paper RPG? And on the DS? Sounds great!) but it's 3DS only.