I love Kaoru, and I'm sorry, I really am, for saying this --- Comparing the two is unwise, but... Kaoru reminds me an awful lot of Sekai Saionji, and for those who know who Sekai is, that isn't looked at as a good thing to most, but for me it is.
I get the feeling that's considered off topic, so I'll say a bit more. Kaoru is my second favorite heroine, and her tomboy nature is a big reason for that.