My absolute FAVORITE character design. It also didn't hurt that I was pretty decent with Q back when I played SF III: 3rd Strike. The trench coat and fedora combo, nice suit and tie, and the metal mask really just has that air of mystery that the developers and artists were going for. Plus, not only was his look amazing, but his animation was superb. Such a clumsy style and yet, a powerful one too.
I really liked Fishers look. The early games in particular really stuck with me. The perfect look of a modern ninja. Those three lights from his Night Vision Goggles are just perfect. I will say that his wardrobe in Splinter Cell: Conviction was also really good.
When some one says "Dreamcast", this is what I think of. The characters of Jet Set Radio (Jet Grind Radio in the U.S.) were some of the best designed characters during the Dreamcast in my opinion. Bright colors, the cel shaded graphics, it all blended beautifully. It wasn't just the GGs either. Poison Jam, Noise Tanks, the Love Shockers, even the police looked amazing.