Poof was one of the Angry Birds that appeared in Black Yoshi and the Birds Episode 7, where he was killed off. In the episode, he got kicked out of his apartment, and moved to where Big Red and the others live. He hasn't marked any appearances ever since.
He can poof into huge bubble like bird due to his power in the Angry Birds games.
Poof is the only Angry Bird that is not voiced by Lovell Stanton.