The Merchant is a multiplayer character in the upcoming game,Assassin's Creed: Brotherhood . Not much is known about this character, altough he does make some appearances:
It's name appears in one of the polls on Assassin's Creed Facebook page.
In the multiplayer walkthrough for ACB, in the character selection screen an icon, which shows a person with a red cap and outfit appears on the rear right (second link, watch part on 0:15).File:Unasdtגגitled-8.png
In some images the Merchant is shown (the picture below for example).
