Inu-papa
I think Inu no Taisho -aka Inu-papa- was so cool. I noted that meanwhile Sesshomaru inhereted the look, Inuyasha definitely got the temper, I mean, his old man went destroying everything in front of him just to get Izayoi. The kind of overprotectiveness -and rudeness- that Inuyasha has.
Anyway, I think the character was so well developed, he was so cool.
And I gues that's why they call it the blues...