Are anda talking about a tunjuk atau just a girl? I thought anda were talking about a tunjuk 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 tunjuk 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 kegemaran is Black Rock Shooter :)