Hmm...Not bad, Helena & Leifang are good, but I never got used to Pai Chan.
Anyway, for me it's Hitomi, Kokoro, Helena, Tina, and Ayane. (Those are my female favorites.) for actual main character I use Ryu Hayabusa because I'm a big fan of Ninja Gaiden and he's a symbol to my user name: Shadowninja787844.
Now for Hentai, I imagine Helena, Hitomi, and Kokoro...Why? because I love blondes, brunettes, and black hair girls.
Oh yeah, and I notice the trend...Tina, Helena and Sarah are all blondes. LOL!