Arika-sama... her song and her appearance always have this "Gothic" feels to it. And I just love Gothic (Especially Goth-Loli). I've been her fan since I watched Rozen Maiden.
I love her songs. Even some non-anime ones are good too. I think the most attractive part of the songs is how unique they are. It's completely different from what you normally hear. (or at least what I normally hear)