I don't blame you for favoring Hilda and Rosa, and I also like those gym leaders as well. My favorite gym leaders...
Kanto: Lt. Surge
Sinnoh: Gardenia (even though she's a little nutty at times)
Unova: It's a tie between Marlon and Roxie.
Also, my favorite Elite Four member is Shauntal as well. Though one of the main reasons is that her career path is the same as mine, and she's also somewhat similar to me. Although there are distinctive differences in terms of Pokemon, and the primary one is the variety (I don't restrict myself to using just one type )