Please remember that datamined information is always subject to change.
Hearthstone's Protector Mercenaries are the primary line of defense for your Party. They deal double damage to Fighters and typically have higher Health values than Fighters and Casters. They can help control the game through Taunts and buffs, though you won't find them particularly good at ranged combat, and they are a bit slower than other roles.
So, who are the Protector Mercenaries that are launching with the new mode on October 12? Here they all are! Click on any of them to view all of their equipment and abilities!