Final answer:
The individual from the thane of Fife who discovers Duncan's body and ultimately kills Macbeth is Macduff.
Step-by-step explanation:
The character in Shakespeare's play Macbeth who is the individual from the thane of Fife, commanded by King Duncan to visit him early in the morning at Macbeth's castle, discovers King Duncan's body, and ultimately kills Macbeth is Macduff. Macduff is initially suspicious of Macbeth's rapid ascent to the throne and becomes overtly antagonistic towards him after discovering Duncan's murder. His role is critical as he represents the moral opposition to Macbeth's reign, leading an army against Macbeth and eventually beheading him in a fight, bringing the play to its climax. In Shakespeare's "Macbeth," the individual from the thane of Fife who plays a crucial role in the unfolding tragedy is Macduff. Initially, Macduff is tasked by King Duncan to visit him early in the morning at Macbeth's castle. However, he arrives to discover the horrifying scene of King Duncan's murder. As the play progresses, Macduff becomes a key figure in the resistance against Macbeth. He plays a pivotal role in the downfall of Macbeth by ultimately confronting and killing him in a climactic duel. This act serves as a form of justice and redemption, fulfilling the witches' prophecy and restoring order to Scotland.