What characters demonstrate loss of innocence in The Great Gatsby (at least 3)?

Nick Carraway experiences a profound loss of innocence. He becomes so disillusioned with the way events unfold during his summer on Long Island that he feels forced to leave and return to the safety of the Midwest. As he comes to terms with his experiences, he refers to the people he associated with, presumably Daisy and Tom, as "foul dust" and claims that only Gatsby renews his faith in the human race.
George Wilson also experiences a loss of innocence. When Tom stops at the garage on the way to New York City for his confrontation with Gatsby at the Plaza Hotel, he learns that George is leaving town. He further learns it is because George has discovered Myrtle is having an affair, though he doesn't know with whom. George has lost his innocent assumption that his wife is faithful to him.
In a parallel situation to George's, Tom also experiences a loss of innocence as it suddenly dawns on him that Daisy has been having an affair and also that his "friends" Nick and Jordan have known all about it and said nothing. It's a shock to him that Daisy would do this to him, although he has been doing it to her since the marriage began. He is also surprised that she has taken up with someone he considers so beneath her, even though he himself has a history of affairs with working-class girls.