The villain in Othello is Iago, a four-letter name. Iago is a scheming and manipulative character who is driven by jealousy and revenge. He is the antagonist of the play, and his machinations are responsible for the tragedy that ensues. He is a master manipulator, using his cunning and intelligence to manipulate the other characters in the play. He is also a master of disguise, often disguising his true intentions and motives. Iago is a complex character, and his motivations remain mysterious throughout the play.