These two are among my favorite fictional female characters at the moment.
KOS-MOS (Big shocker, right?) and Remilia Scarlet.
Been a big fan of KOS-MOS the moment I saw her in Xenosaga one all those years ago. I've always liked robotic characters, and KOS-MOS immediately appealed to me. Not only was she an android, but she kicked ass, had blue hair, and was lovely looking to top it all off!
I've only recently discovered Remilia Scarlet. I like the diversity of her character. She can be suave and charismatic, cute and cuddly, sinister and powerful, or down right wicked. Plus she is a vampire with bat wings!