Warlic's eyes were always violet, yes reiquem, but something does seem odd about him... at once more worried, and more at peace than before. As if he's been slightly corrupted by Cysero's sense of humor, more openly amused. Also his hair seems longer than it used to be, and more flyaway.
I guess it makes sense that he was using the Professors powers, since the Professor was part of him. If anyone would be able to answer instantly who is an infernal, he would, having been one, I guess.
sincerely, your friendly neighborhood warrior thespian dark lord and counter guardian Gamma Cavy