The Duke of Illyria, who is deeply infatuated with Olivia and employs Cesario to woo her on his behalf. Despite his fixation on Olivia, he shares a close bond with Cesario.

A noblewoman in Illyria mourning her brother's death, who manages her household independently. She becomes enamored with Cesario, unaware of the disguise.

Olivia’s lively uncle known for his fondness for drinking and mischief, frequently engaging in revelry with friends at Olivia's estate. He loves pranks and schemes, often at the expense of others around him.

A servant in Olivia's household who is serious and ambitious, often clashing with the more jovial residents. His self-importance makes him the target of a practical joke by those around him.

The clever Fool of Olivia's estate who uses his wit and musical talent to entertain and impart wisdom. He is known for his playful wordplay and insightful commentary.

A knight staying at Olivia’s estate, intent on courting her but often distracted by festivities. He is easily influenced by those around him, particularly Sir Toby.

Olivia's clever chambermaid who orchestrates the prank on Malvolio. She is close to Sir Toby and his circle, often participating in their antics.

Viola's twin brother who survives the same shipwreck and ends up in Illyria. He is impulsive and brave, unknowingly involved in mistaken identity situations due to his similarity to Cesario.

A sailor who rescues Sebastian and accompanies him to Illyria, displaying loyalty and affection. His past conflicts create tension upon entering Orsino's sphere.