Steadfast Moral View
Brutus epitomizes the static character in that his world view, based largely on a philosophy called stoicism, doesn't change despite the evolution of the story. Ironically, it was Brutus' beliefs in tranquility and serving the moral good that caused him to change perspective on Caesar. Early on, the two were friends. However, Brutus was convinced by Roman senators to kill Caesar because he had become too powerful and was going to transform the government into a dictatorship. Brutus believed assassinating Caesar was best alternative for Rome as a society. You could argue that Brutus changed from friend to foe, but his lack of philosophical change actually guided his actions in response to Caesar's transformation.