Barry Robinson (voiced by Eddie Kaye Thomas for the normal voice, Craig Ferguson for the evil voice) -- Steve 's morbidly obese friend, who has an inarticulate, strident, and sloppy vocal quality. Stan disdains Barry, often impulsively yelling insults at him about his weight without even knowing why. Like Snot, Barry can speak Klingon and seems to be able to read Quenya. Barry apparently has a fetish for Miss Piggy. His borderline mentally retarded and innocent personality is the result of powerful anti-psychotic pills. In "one episode '' after stopping his medication regimen, Barry turns into a deranged and demonic mastermind, speaking in a low - pitched voice "like Gary Oldman '', framing Steve for the destruction of Stan 's beloved commemorative plates. Barry did this in an attempt to replace Steve within his immediate family. Barry 's madness grows worse over the episode, culminating with him trying to eliminate everyone that might get between himself and Stan. Steve ultimately tricks Barry into taking his medication, reverting him back to his usual self. This facet of his personality is hinted at when he helps Snot and Toshi beat up a drugged Steve and screams that they should kill Steve 's whole family. Barry describes his parents as ignorant and implies that they engage in bondage sex play and smoke pot. Other statements about his parents imply that they abuse him or are negligent, making him sleep in their basement and often forgetting he is their son (and that they even have a son).
who does barry's voice in american dad
Eddie Kaye Thomas