Iago
Iago is a parrot from Walt Disney's Aladdin. He is the servant of Jafar. He appears in all the Kingdom Hearts games, and is voiced in the games and the movie by Gilbert Gottfried. He also appears in Walt Disney's The Return of Jafar, Aladdin and the King of Thieves and the TV series of Aladdin.
Kingdom Hearts
In Kingdom Hearts, Iago is the Jafar's servant. He plays a minor role, normally just appearing on Jafar's shoulder in cinematics, but he does steal the lamp from Aladdin. He later appears holding Jafar's lamp in the boss battle, and he flies around with it. The lamp is the main way to do damage to Jafar's health. Unlike the movie, Iago simply flies away at the downfall of Jafar.
Kingdom Hearts: Chain of Memories
Iago makes a small cameo appearance in Chain of Memories, holding the lamp during the Jafar boss battle, like in the first game.
Kingdom Hearts II
In Kingdom Hearts II, Iago, like The Return of Jafar, has turned over a new leaf. He wants to prove himself to Aladdin. He does so by taking the lamp from Pete and by blocking an attack on Aladdin from Jafar.