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. In Angry Birds Epic and Angry Birds POP! on every Friday, he stars as a guest character.
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 freerolls in his Golden Pig Machine.
In Arena Battles
Before an unknown version, it was also possible to battle him in Arena Battles and perform freerolls 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.
In Chronicle Cave
You can hire Piggy McCool for free in Chronicle Cave (Once per day). However, if you had used Piggy McCool in a dungeon, you cannot use him in the Cave, or vice versa.
In the game, he appears as a guest character in a short period of time, where he is playable and assists the player in any task. His Pop is the Plunder Pop, where he can shoot a bubble that destroys some bubbles and gives the player 3 bubbles. He is a hero in this game as he is in Angry Birds Epic.
Angry Birds Evolution
He appears as a CPU, in which the player has to defeat his birds in a battl, he doesn't appear physically though, not even in icons. Dr. Strangebird Piggy Nian are based off him and are basically the equivalent to Piggy McCool in gameplay.