Monika is noted by the other characters to be smart, beautiful, confident and athletic. She's not as talkative as the other girls, but this implied to not be through choice.  she shows a much more manipulative personality. It is revealed that Monika was self-aware all along and resented from being made into a minor role. I did a short line for Monika and a kind of long one you can pick which one you want to do!