Lady Macbeth is generally considered to be a round character in the play "Macbeth" by William Shakespeare. A round character is one that is complex and has many different and even contradictory characteristics.
Lady Macbeth is initially portrayed as a strong-willed and ambitious woman who is able to manipulate and convince her husband, Macbeth, to commit murder in order to fulfill her own desires for power and status. She is determined to become queen and will stop at nothing to achieve her goal.
However, as the play progresses, we see a different side of Lady Macbeth. She becomes consumed by guilt and regret for her actions and starts to unravel mentally. She starts to have nightmares and hallucinations, and she is unable to wash off the imaginary blood on her hands. Her ambition is slowly replaced by guilt and her desire for power is replaced by the desire for forgiveness.
Lady Macbeth is also a complex character in the way she interacts with Macbeth. Initially, she's the one who pushes Macbeth to kill King Duncan and become king, but as the play progresses, Macbeth becomes increasingly ruthless and violent, while Lady Macbeth becomes increasingly passive and submissive.
In conclusion, Lady Macbeth is a round character due to the complexity and contradiction of her characteristics, her ambition and determination that later on turns into guilt and regret, and her interactions with Macbeth, where she goes from being the driving force behind his ambition to a passive and submissive partner.