Corrado Zeller
I've never understood some of the reviews I've read that say that Zeller is a caring, sensitive character. I think he's the complete opposite.
To me, he seems intent on exploiting Giuliana's vulnerability. The scene where she goes looking for him in his hotel for help and he starts undressing her is one I find very difficult to watch.
It's almost as though he has no sense of shame. In his final scene in the film, Giuliana tells him that he hasn't been able to help her and he just walks out and doesn't say a word to her!