Hmmm, well I'm going to go with Lord Sesshomaru, Yusuke, Vegeta, Hiei, Spike, and Mugen. I'm sure I left someone out but not really awake just yet to think about it in full detail.
Wearing bells in your hair certainly puts a downer on looks. Kenpachi is pretty cool, but he does look quite stupid. And it seems whenever he's on screen the same thing happens every single time. Kenpachi holds back, gets cut up, stops holding back as much, kicks ass, gets cut up, stops holding back even more and then kicks more ass... That might sound pretty cool, but when it happens every single time without him seeing any sign of weakening, it gets pretty tiresome.
Besides, he's nowhere near as characters such as Alucard in terms of strength, Johan in attitude, etc etc. He's cool, just not as cool as a lot of other characters that I'd place higher.