Barnaby is a tan rabbit clad in a suit of gold plate mail, complete with a great helm and over-sized gauntlet on his right paw. He carries a large great hammer, along with a backpack filled with various items including a lantern.
The Rabbit Sapper was first revealed on May 4, 2014 once the Rat Assassin was unlocked on the Armello Kickstarter campaign. He himself was made available to backers once the $235,000 AUD stretch goal was reached.
Sappers are combat engineers employed in a number of armies world-wide, with their primary duties being to build up or demolish structures, simultaneously advancing the movement of their own forces while impeding their enemies.