Terminus

Terminus is a deseased bird but still lives on as a spirit, a reincarnation of Void Termina, and another side bird of The Legion.

Personality
He's mostly positive and kind to other people. Since he's Void Termina's reincarnation, he needs to be feeded with mostly positive energy, that's why most of the time he holds a juice box. In times, of crisis, Terminus will always risk his lives for his friends and will do anything to protect them.

His death
It was'nt established on his origin game. When in the castle of Cubicons, Terminus and a Cubicon were having a sword fight. The Cubicon sliced his mask. Then his sword was bright red and then he was stabbed. Thus, he died. Myusix cried over his dead body.

Angry Birds: Shade's Big Eggventure.
Appears as alive. Captured by Cubicons, and unlocked at level 26-7

Angry Birds: Ultimate
Appears as a spirit and a playable character.

Trivia
Terminus is based off of Void Termina from Kirby Star Allies.

He's one of the people in the Angry Birds Series who have died.