Think about it, you are an heir to the Yakuza and you will rule by an age which you are still in high school. The stress of having to maintain an organized crime group, coupled will the existing stress of having to study and go to school, will pretty much drive the would-be ruler to suicide, as demonstrated with Yukio.
Whenever Revy goes into "Whitman Fever" mode, she can be absolutely terrifying.
Anytime Eda removes her shades, the laid-back party girl persona vanishes completely as she enters her CIA mode with a look that could kill the most macho of men. It's quite unnerving on how much of a change it is. Even Mr. Chang got pissed off after having a phone call with the lady. And this whole time we thought Balalaika was the ruler of Roanapur? Even more creepy is the way that she warns Rock not to try and learn any more about her affiliations, indicating that she may or may not truly consider them anything, let alone friends. Yeah, it's that creepy.