I choose this prompt on Caesar’s "fatal flaw", and his last line (‘Et et, Brute? Then fall Caesar), because first, I found it very interesting when I read it at first, and I think that line makes Caesar more three dimensional than he had previously seemed in the play.
When I read last Caesar’s last line, it made me think several things about his true personality. (At least, his true personality in the play, as his true historical personality may have been rather different.) First it struck me that Caesar was actually hurt by seeing Brutus against him, possibly it hurt him more than the actual wounds done to him. Up to this point it had seemed that Caesar was a little bit above being hurt by what someone thought of him, or what someone one tried to do to him. (Or at least above admitting that he was hurt.) However, Caesar was hurt by this, and the end of the line "then fall Caesar." Makes it seem that Caesar respected Brutus’s view so much that he fell for Brutus; or that as Brutus was in a way the mouth of the people; Caesar decided to fall for the people. To fall for Rome. It is almost as if he had actually put Rome ahead of himself, almost in a way joined Brutus and the conspirators against him, as if Brutus thought he was bad, then surely he must be. If this is indeed what Caesar meant by his last line, then it would be quite contrary to the view of him as a tyrant, and a ruthless leader. Perhaps he still did want to be a King/Emperor type figure in Rome, but he thought he was doing it for the best of Rome. This is of course assuming that that is what he meant by the quote.
However, if that is what Caesar meant, then it is quite Ironic for Brutus etc. as it would mean that in his last line, not only did Caesar show no signs of the reason for which they killed him, but he actually disproved the reason for which they killed him. Yet not a single one of them really seems to notice this, they seem to be a bit caught up in the moment.