Blues

The blues are almost always side characters there is an exception in Angry Birds Go! Indoor Racing Tournament. He is featured in Angry Birds Space Special, Angry Birds Visit The Mushroom Kingdom, Angry Birds Epic and Bad Piggies 1 and 2. Like all the other characters he or they are voiced by Arno.

Trivia
He is the only bird that is featured in Bad Piggies 1.

A common joke is that he always says he's Five but Red says he's Four.

That the other blues are from Angry Birds Space.