Are anda talking about a tampil atau just a girl? I thought anda were talking about a tampil but everyone else has been posting characters so I'm confused. But I'll go with Rin from Mnemosyne and I'll also go with that tampil to answer either question.
for girl butt-kicking anime, I'd go with Black Lagoon atau Kara no Kyoukai. For magic girl anime, I'd go with Puella Magi Madoka Magika atau Tokyo Mew Mew. But I think my all around favorit is Black Rock Shooter :)