Used to watch a lot of T&J cartoons growing up, as well as a lot of Walter Lance cartoons that probably couldn't be aired today without a lot of heavy editing. Hell, I used to spend most of my Sat. mornings watching WB cartoons! Also liked some HB and Filmation, though looking back on those cartoons with modern eyes makes me wonder why on earth for.
More recently, it's still WB - Pinky & The Brain, Animaniacs and Tiny Toon Adventures. Also like me some anime, too, especially Slayers. But narrowing everything down to just one character? That's tough. If I'm out somewhere and come across WB characters my interest picks up, and I'll probably be looking for her: