A younger brother of Alonso, the King of Naples, Sebastian is a two-dimensioned villain number two in this story. He looks like a puppet of Antonio, who persuades him to kill his elder brother, following his own pattern used against Prospero. Sebastian probably views Antonio as his tutor in his ways of living: he has the same mannerisms, same greediness, same mockery, same cowardice and same lack of evolution and remorse. Absolutely inappropriate to seat on the throne of Naples, Sebastian loses his phantasm of a hope when Ferdinand, alive and soon to be married, is shown to Alonso and his companions.
Sebastian in the Essays