The Bad Piggies as they're called are also referred to as the Green Pigs or at times just Pigs. The Pigs are surely one of the main characters in the series; because, without them the birds would just not be ANGRY!
It's the duty of these pigs to steal the eggs of all the birds with an intention of cooking and eating them. But, if you've played the game you would know that the birds aren't going to lose the war and hence they unite in order to whack the Bad Piggies.
But, the pigs need to survive and in order to protect their food the King Pig orders the Piglet army to construct various structures that are used to protect them and the eggs they stole.
No matter which season you're playing, one thing is common - the pigs are all green. But, off course there are different kinds of green pigs the basic one being the most common among them. Depending on the level you'd see small, medium as well as large basic pigs - at times all of them together too.
When the pigs wear a helmet they're termed as the Mining Pigs; but, basically they're exactly the same as the basic pigs. If the pig has a hard hat on, it's termed as a hardhat pig and so on.
From the fourth episode onward the pigs dress in various attire such as: hard hats, pumpkins, ghost sheets, Santa hats in the holiday episode, cowboy hats, bows as well as sombreros. But, these hats are just fashion accessories and don't protect the pig in anyway.
Even though pigs are one of the smartest species on the Earth, in the game they're regarded as foolish and insane as they lack basic intelligence. They consider bubbles as eggs in the later episodes.
When it comes to angry bird soft toy options, there are plenty of Bad Piggy toys as you can see (Various hats and sizes).