Without a single doubt, Chucky. The number of Chucky shirts I saw at HHN last year *each night* was nothing short of staggering.
Now UCM is solid, to the point where lots of folks will be happy with any new house or merch to come from that, myself included.
But Chucky? You could have him be this year's Icon without question, that is how much of a bigger draw he is right now.