Try using these AU's in GB in combination. Not sure if any of them will give you the anthropomorphic qualities your looking for but if you spend some time experimenting with them you might come up with something.
Things like KTGranulator have many presets you can try out. You might try some of the extreme settings in something like Detune and Monstachorus is combination with everything else. Like I said experiment, and save the setting you like!
AUPitch, Vocal transformer, Auto wah,
Try these free AU's
KTGranulator
http://koen.smartelectronix.com/KTGranulator/
Detune is included in a pack of free AU's
http://mda.smartelectronix.com/effects.htm
MONSTAchorus, SupaPhaser,
http://www.apulsoft.ch/freeports/