Malvolio is a major character in William Shakespeare's play Twelfth Night. He is a steward to Lady Olivia and is known for his extreme self-love and vanity. VIOLA is the protagonist of the play and is a young woman who disguises herself as a man named Cesario. Orsino is the Duke of Illyria and is in love with Olivia. BELCH is a drunken friend of TOBY, who is a relative of Olivia. Olivia is a wealthy countess who falls in love with VIOLA, who is disguised as Cesario.