If we don't get Kappa Mikey as DLC I'm going to lose my mind. And screw Crimson Chin, Ultra Lord is where it's at!
In all seriousness, XJ9 and Jimmy Neutron are my most wanted and most expected DLC picks. Carl Wheezer, Hugh Neutron, Snap from Chalk Zone, Otis and Snotty Boy from Barnyard are also desired.