If you could have an army of.....

[UpcountryGecko]

An army of bears with guns:

http://pix.motivatedphotos.com/2008/7/14/633515970994729288-bears-with-guns.jpg

 

[Pezzer]

An army of Rick-Astley look-alikes with singing and dance training.

COWER IN FEAR!!!

An army of Chuck Norris.

was gonna say this but the OP said not an army of one person.

My back up army would consist of famous people with british accents, lead by STEVEN FRY!!

 

[awesomeemosewa]

an army of elfen leids or a army of zombie wizards eather way i win

 

[captainwolfos]

An army of horny killer bunnies, they breed faster than you can kill them plus think how deadly they are. Muehahahahahahaahahaaha

You said horny killer bunnies and I immediately thought of the rabbits from some of the Mighty Boosh live sketches... Now an army of those would be formidable. And disturbing.

On topic, however, I would like an army of werewolves

 

[Jeremy66]

An army of spy crabs, because you can't kill them and once you turn your back they stab you and go back to crabbing, or Spartan twos.

 

[Crimsane]

Oh. My. [Diety].
it looks so sad I want to adopt it now!
*Shoots self for guilt ridance*

Slight flaw in my plan suddenly becomes evident. Must not expose allies to my army.

 

[Perwer]

An army of children. Bring on the chaos!

If they're children from games they can't lose, literally.

I would want an army of people with rebounding health meters, and VATS.

 

[SnowCold]

An amry of gods.

Beat that.

 

[Jelluh94]

An army of stick figures!

 

[Twilight_guy]

An army of spies. The enemy would be sitting in there camp getting ready to fight, and then suddenly, a spy would appear in the middle of the camp and say "gentlemen" before every enemy soldier is simultaneously backstabbed.

 

[TheCrapMaster]

An army of barbeque grills with the best of the best with typ of meat on full grill to distrakt all other armys while i run away.

 

[General Ken8]

Big daddies
The Elite Rosie kind
http://www.supercheats.com/guides/files/guid/bioshock/9-eliterosie.jpg

 

[Et3rnalLegend64]

An army of GUNDAMS. Tallgeese III is the leader.

Spoiler

 

[Mozared]

POLAR BEARS!

With star wars laserguns.

 

[Angus565]

An army of exploding headcrabs.
Think about it, they jump on somebody's head then...KABOOM!

 

[DJ Lord Destructocon]

An army of cows. they'll rise up one day, y'know.

I'm guessing you haven't played diablo 2 then.....

OT: An army of Sea Kittens!

 

[Icedshot]

An army of zombie carp..

 

[johnman]

Army of blood suckers from stalker

They turn invisable for 90% of the time so the first thing you see if yourself dying.

 

[yaik7a]

ENCLAVE SIMGIMA SOLDIERS