As much as I like evil villains in animes, I'd say this guy
is a total d**k. Yes, Koga, you have mental problems and think everybody hates you, including your master and your sword. Wow, how unoriginal you are. He's got all this lovely power and never shuts up about it. I was watching Bleach last night on Adult Swim (4/28/2012) and was yelling at him and telling him to shut his mouth and name-calling him. I don't know why Muramasa wants anything to do with this vengeful, abusive, control freak anyways. He has zero class as a villain. I prefer Sousuke Aizen and Gin Ichimaru over this a*****e. His own sword, Muramasa has way better class and style and isn't so damn ugly to look at either.
I do say of all the Bleach filler arcs, this one with the freed zanpactos has to be my most favorite. You just get to see what they look like and how they fight, especially against their soul reaper masters.