Matilda is the secondary tritagonist of The Angry Birds Movie. She is first introduced as Red's anger management instructor, and from then on appears very oftenly in the rest of the movie, and is involved in the battle with the pigs.
Personality
It is shown that Matilda has her own anger management class, which is how she meets many flock members, Red, Chuck, Bomb, Terence, and Hal and Bubbles, who worked for her in the background.