The down right horrid people from season two, Josie who was a complete nutter (I swear she was either high or drunk or both in the episode where she got Kristen eliminated), the Witches from the Texas season.
With the exception of Josie who was just plain mad as a hatter these people went beyond douche. They were outright vindictive and loathsome.
They should get all these people together for a Hunger Games style season. Throw in Mike Isabella too for good measure.