Seeing as I cannot vote for Arhras the fallen phoenix (or however you spell his name)
It's got to be Asurman. Seeing as he is the living representitive of the phoenix and the 'father' of the Aspect warriors...meaning he trained the rest.
And to the guy on the first page who said Karandras can't kill tanks, what the hell is 6 str 8 attacks for then?
And Maugan Ra....5 str 6 rending shots when using fast shot?
Read the codex before making daft comments. Newer players will be put off models by such infomation, false or not.