Viola, the Duke, Sebastian, and Antonio in Twelfth Night employ metaphor, simile, and irony to enhance the play's themes and character dynamics.
1. Metaphor: In Viola's lines, 'From the rude sea's enraged and foamy mouth Did I redeem,' the metaphor of the sea's mouth conveys the violent nature of the sea.
2. Simile: When the Duke says, 'And as the morning steals upon the night, Melting the darkness,' he uses a simile to describe the clearing of confusion and ignorance.
3. Irony: Viola's situation where Olivia falls in love with her disguised persona, Cesario, showcases dramatic irony as Olivia is unaware of Viola's true identity.
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