Which character is known for his tragic flaw of excessive ambition in Shakespeare's works?

The character renowned for his tragic flaw of excessive ambition in Shakespeare's works is Macbeth. This ambition drives him to commit regicide to fulfill his desire for power after receiving a prophecy from the Weird Sisters that he will become king. Macbeth's unchecked ambition leads him down a path of moral decay, paranoia, and ultimately, ruin.

As he becomes increasingly consumed by his desires, he commits further atrocities to secure his throne, illustrating how ambition can lead to one's downfall. This theme is central to the play, as it explores the consequences of allowing ambition to override ethical considerations, resulting in isolation and despair.

In contrast, Othello's tragic elements center on jealousy and manipulation, Hamlet grapples with indecision and existential questions, and Prospero deals with themes of power and forgiveness rather than ambition in "The Tempest.” Thus, Macbeth stands out as the embodiment of ambition turned destructive, making him the answer to this question.