Piggy McCool is a Minion Pig that was disguised as a Blue Bird that first appeared in the Angry Birds Toons episode "True Blue?". In the episode, he was set up by Chef Pig to distract The Blues and steal the Eggs.
Role in Angry Birds Epic
As a friend and his shop
Piggy McCool (also known as Merchant Pig, in levels) also appears in Angry Birds Epic. He has a shop where you can buy resources and other things. He is your "friend" and you can have free rolls in his Golden Pig Machine.
In Arena Battles
You can also battle him in Arena Battles and perform free rolls in his Golden Pig Machine.
You can hire Piggy McCool for free in Dungeons. You can hire him for free only once per day (paying Lucky coins for additional consecutive uses) and use him the next day for another dungeon.