Well?  Any takers?

Me?

Area: We'd be fighting on a 400 square foot island in the middle of the ocean during a lightning storm.  This storm would poor rain diluted with blood of the main character's friends, family and love interest. (Spoiler: I kill them right before the fight.)

Stages: I'd have 2 stages.  A humanoid one in which I fight with a large katana.  Second stage, I'd become some chimera-like beast with the head of a turtle on the left, head of a bear on the right, and a middle head that's human but with a bunch of burns and slash scars and a sinister grin for good measure.

Music: Hold Your Colour by Pendulum for stage one.  Granite by Pendulum for the stage two.

Text:  There would be 3 pages of quick and to the point monologue.

Silly isn't it?

Just epic slowmotion matrix match.

In the middle of the city, using innocent bystanders as living walls, bad weather, maybe raining, around 10 degrees C. Wouldn't try talking with the main character, what's the point? He wants me dead, i want him dead. Fighting with guns and if needs be, then hand to hand.

Music in the bg...i think i'd take "Remember the name" by fort minor. For the simple reason that it's a good song.

Crap, I'd fight that final boss.

a retarded plotwisted guy with a crappy ending that doesn't make any sense

can i be an innocent bystander?

Here is how it would work. It would be a coop game, with up to four people playing (or having AI buddies). The battle would be set inside a giant castle, with a thunderstorm brewing outside. It would have lots of creepy dungeons and dark corners, and be filled with ornaments that I could scale. I would be a stealthy boss, and this would be a game of cat and mice.

The players carry guns, but have limited ammo, and there is limited lighting in the castle. They will carry flashlights, and will get brief flashes of light from the thunder outside.

It would be a very long level, where players can try to take me down or escape the castle, neither of which will be easy.

Basically, imagine playing with three friends, all four of you are playing as one of the Joker's henchmen in Batman: Arkham Asylum, and the Batman just entered the area you're patrolling. Then you get the idea

I'd be like Bowser at the end of Super Mario Sunshine. The battle would take place in my bathtub. Sexy fight!

Uh! I forgot to add, that there wouldn't really be a big introduction for me, and I wouldn't say a word once the hunt was on.

And there would be limited music, only to try and set the mood.

Damn it, I want to play that game!

Chances are, nothing I could ever imagine will be as epic as the final boss in God of War III, so I'll just say "the final boss in God of War III".