Four KS-exclusive, foil heroes which were given for free to backers of the Pack of Heroes campaign. They are Mr. Music (a robotic jukebox), The Black Banana (a ninja chimp), Gum (a sentient piece of bubblegum) and The Brain (a brain in a jar riding a skateboard). The four heroes are Mercenaries and aren't part of any established team. Instead, they can be added to the pregame team draft, and picked up by players just like regular heroes. They all are Fighters (silver) in rank.