Mine are: Remilia, Meiling, Okuu, Reisen, Yukari, Momiji, Koakuma, Suika, Byakuren, Shou, and who doesn't love Chen and her Chensaw?

My favorite is Nitori. Marisa, Cirno and Suwako are right behind. Yoshika is a more recent one I'm starting to like. How it can look moe and lifeless at the same time in it's art is so funny to me.