TV.com counted down their favorite secondary characters that caught their eye this year, listing 'Castiel' (played by Misha Collins) as their #9.
From TV.com: "Forget his character and all that–how about that introduction with those gigantic angel wings! As the heaven-sent servant ordered by the big man upstairs to help guide Sam and Dean Winchester, Castiel's brooding gaze and menacing voice make it clear: he ain't no ordinary angel, and he don't need no harp."
Source: TV.com.