Final answer:
Antonio's character is consistently power-hungry and scheming from Act 1 to Act 2 in 'The Tempest', showing a deepening of his manipulative nature as he influences Sebastian to consider regicide for political gain.
Step-by-step explanation:
Antonio's character in 'The Tempest' does not appear in a prequel to the play, nor does he have a direct role in other unrelated works by Shakespeare. It's important to focus specifically on Antonio's development in 'The Tempest' itself. In Act 1, Antonio is revealed to be a power-hungry individual, who usurped his brother Prospero's dukedom. He does not show remorse for his actions and instead, continues to display his Machiavellian nature. By Act 2, although there is not a vast change in his character, his interactions with Sebastian suggest a deepening of his scheming personality as he tempts Sebastian to murder his own brother, Alonso, so that Sebastian can become king of Naples. This further solidifies Antonio's character as someone who is manipulative and seeks to influence others to undertake dark deeds for political power.