I haven't a full answer for you, but here's how I'd suggest you start it:
There's clear evidence of your theme in the lines "When the poor have cried, Caesar hath wept."
Reason being: Brutus only <em>told (verbally) </em>the people that Caesar was ambitious, giving <em>no </em>examples that are actual proof of how the great Julius Caesar acted. However, Mark Antony states right off the bat of what Caesar had done in his life-time. Antony decidedly debunks Brutus of any honourable traits as he continues with his Eulogy, as the more Antony says Brutus is "honourable," the more it is hypocritically placed. (<em>What I'm trying to say here is the more Antony says Brutus is honourable, it actually counter-intuitive, Antony is trying to take away any honour the horrible man had.)</em>
To find the theme, you look for the main idea or topic.
The irony is that they think that Columbur intends to harm them. But infact, columber wants to help them by giving them a pearl.
First person , The text says I and me multiple times