First one I experienced was Duffman. I was disappointed, but it was kind of its own joke that he would just go to each location to air hump. Frink's questline, not as "satirical", so yep, just disappointing. Still like him though.
he's not the only premium character to have no dialogue in their questline. the others are hank scorpio, hans moleman and the squeaky voiced teen are the ones that I know of
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But i guess it's an indication of how the game has evolved. Frink was an original premium. I'm glad new characters have more interesting dialog now.