Throughout Act III, the plebeians are portrayed as being swayed by emotions and easily influenced by charismatic leaders. They lack critical thinking skills and do not question the motives or arguments of those addressing them. Brutus, who had earlier addressed the crowd with a rational and logical speech, fails to connect with them on an emotional level and ultimately loses their support.
The plebeians are also depicted as having short-term memories and being easily swayed by appearances. They quickly forget the misdeeds of Caesar, such as his ambition and dictatorial tendencies, and focus solely on his generosity and popularity. Antony's skillful use of Caesar's cloak and the display of his wounds appeals to their emotions and overrides any rational judgment they may have had.
Overall, Shakespeare's portrayal of the plebeians in Act III highlights the vulnerabilities and limitations of the common people in a political context. He presents them as being susceptible to manipulation, emotional appeals, and lacking the critical thinking skills necessary for making informed decisions. This portrayal serves to emphasize the importance of leadership, charisma, and the ability to sway public opinion in shaping the course of political events.