I don't know that they're "pros", but when the game first opened, Shagger was the only available specialty, and naturally the players who have been active since then have the highest Hardcore. Your Specialty is indicated by the icon to the right of your name; a Shagger has the flogger icon, a Lover has the Rose icon, and an Expert has the Target icon. For best attack you should be developing your specialty's stat first, and pick an Alpha of the same specialty to bring your minimum attack highest.
If you aren't a Shagger and intend to PvP, you'll need more Hardcore for better defense against those guys who got the early start on you. If possible challenge them only when the judge favors your specialty.
Kimie is one of the best for Charm, and provides excellent starting Ego and Excitement. As a Shagger I sometimes place her Alpha for the Charm defense, as she has some of the best Hardcore, too.