Final answer:
Edmund's soliloquy reveals his pivotal role in the plot and his justifications for his actions, which foreshadows the drama to ensue.
Step-by-step explanation:
Edmund's soliloquy in which he outlines his plans to usurp his brother's inheritance significantly impacts the perception of his character and the play's plot. This soliloquy does not create a generous portrait of Edmund nor does it make the audience more receptive to his views, rather, it highlights Edmund's role in the plot as being pivotal. While it provides insight into his motivations, allowing him to justify himself and his duplicitous actions, it also sets up the audience for the consequential drama that these actions will cause. The soliloquy serves as a powerful literary device that Shakespeare uses to give the audience direct access to the character's thoughts, thereby allowing us to understand the intricacies of his schemes.