Reverend Parris is one character closely associated with greed.
When he is accused of leaving God out of his preaching and speaking in ways that keep people from bringing their children to church, he responds that the children are "unmindful of their obligations" to the church. He complains that the children are failing to bring him firewood. Proctor responds, saying that six pounds is given to Parris each year for firewood.
Parris then energetically claims that the six pounds is part of his salary and he expects firewood to be given to him as a further part of his due. He also demands a deed to the house that is given to him to live in without rent.
Concerning dictatorship, Danforth is the character most closely aligned with this concept. Danforth goes so far as to refuse to accept valid testimony that would overturn the verdicts of the witch trials for the reason that some people have already been put to death. He decides to continue with the sentences, even if they are invalid, so as not to invalidate the authority of the court (which is also, clearly, his own authority).