I would not recommend using the Wolfbanes in a beginner demo, because they require a lot of tactical manuevering to use effectively (but when used effectively, they are devastating).
my opinion is that simple shooting units are the best to use. Things like Ronin Samurai, Ducal Militia, Capitol Light Infantry, Cybertronic People's Volunteers, and Imperial Regulars and Trenchers are good choices to use. I don't like using Ashigaru in a demo because of the range penalties on their guns.
I would also SERIOUSLY RECOMMEND Topkick's suggestion about the Capture the Flag scenario for the demo. I have presented at a demo the Topkick has organized, and the scenario is easy, small, and really presents the game in a good manner.
B