Answer:
Lepidus
Step-by-step explanation:
A round character is the character in the story has develops and progresses along with the progression of the story. The development of the character is carried throughout the story. In "Julius Caesar", Mark Anthony, Caesar and Brutus are the round characters. Although the murder of Caesar takes place in the initial scenes but the character of Caesar keeps developing throughout the story. On the other hand, Lepidus plays a very small part in the story. He allows Anthony and Octavius to punish his brother as his brother was also the part of the group who planned for Caesar's assassination.