ED-E, for his perk, which is either brilliant or overpowered (I lean towards the former myself, but it does make Perception almost an irrelevance). Raul's pretty damn great too, but he's a pain to get early on. Still, he has the best stories. Hearing him talk about Mexico City made me want them to set the next game there, a desperate fight for survival in the hulking urban ruins. (I know, Fallout=Americana blah.)