So the 6 princes can be categorized into 2 groups: the Gentlemen and the Tsunderes.
Gentlemen: Wilfred, Roberto, and Edward
Tsunderes: Keith, Joshua, and Glenn
However, they can also be classified like this:
Beasts: Wilfred, Keith, Glenn
Passionate Lovers: Roberto, Joshua, Edward
I haven’t really played Glenn’s route, but he seems like a beast xD The others should be very accurate, especially for Wilfred, ~rawr~