Sesshomaru!!! I would go back to the feudal Era to go see him any day!
I got to admit, at first I didn't like him all that well becuase he was always so pissy, but once he encountered Rin and began to show himself more, that's when I started liking his character.
Now I wish they'd at least create a OVA or something to see what all of the characters lives are like now. @Invinsybll