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Prospero's apparently tyrannical stance is revealed in his exile and verbal abuse of Caliban. This oppressive behavior is seen once again when he threaten's to imprison Ariel, a spirit which Prospero controls and the same one which created the great storm on the sea," till/Thou hast howl"d away twelve winters".pg.475. .
Besides Prospero's harsh dictatorship, he very unforgiving to Caliban and Antonio. Readers begin to feel pity and remorse for Caliban once he willingly serves Stephano and Trinculo, and see that he is not corrupt, but rather becomes a sympathetic servant. Seeing that Caliban fears and speaks of Prospero as a tyrant, Shakespeare implies that the fault of alienating Caliban goes hand in hand with Prospero's failure to realize Caliban's limitations and to embrace them, while teaching him to be what he can consummate. Moreover, Prospero's approach to the court party shows that he was only interested in showing off his mighty power in hopes of frightening them, yet readers do not realize at this time he is only trying to help and educate them. Prospero's power and remorseless attitude is a main theme for the beginning of the play and is even further seen when readers discover that he knows about the conspiracy to kill the king planned by Caliban, Stephano, and Trinculo. This information is very useful to Prospero and could help him when he tries to reclaim his place of Duke. Overall, Prospero is seen as a barbarous and merciless dictator who's only wish is severe revenge against those who have harmed him most, but in reality, Prospero does have two sides to him just as any other character does in one of Shakespeare's plays. .
Aside from Prospero's evil plot for revenge and power, one's impression of this character can instantaneously alter at the end of the play, when the forgiveness and remorse flood the pages. It begins with Ariel, when Prospero mentions word that once he has blown them safely home, he is free, at this point Ariel reminds him of his promise once again, and this time Prospero reacts calmly, unlike his eruption of anger earlier in the play.