Hmmmmm ... important question here: Is the wargame set in Europe or Asia,
or specifically in Japan, or are we talking about something like RISK
where it's essentially conquer-the-world?

Essentially conquer-the-world. Any pre-1500 AD army will be permitted (I'd
like to avoid duplicates, though), and as I stated, I'd like to know who
would choose which army and why.  For example, based on the characters'
personalities, who would choose Vikings, or Mongols, or Normans? (I can >just
imagine Tarou playing an Indian army, with the intent of using elephants >to
trample over anything that gets in his way ;-)

Naah. Carthagenian in the manner of Hannibal Barca. ^_-

I think Nabiki would be along the lines of Genghis Khan's Golden Horde
(systematic terror.)

Too bad you're only going with pre-1500. I could see people commanding Grant's
and Lee's armies from the US Civil War.

Damien Roc