If something sounds too good to be true, it probably is.
~ Old saying
SpongeBob: But Mr. Krabs, what about the true meaning of Summer? What about the children? Mr. Krabs: The children? I don't care about the children! I just care about their parents' money! Ah, the fact that their feeble minds are easily distracted by cheap playgrounds and talentless clowns is no skin off my nose!
~ Mr. Krabs on cheating dozens of innocent children out of their money
Characters who regularly try to con people out of money or valuables. They are similar to tricksters and thieves, but of a category in themselves; not all con artists are "evil," but they are all guilty of breaking both ethical and legal laws, and are untrustworthy due to the nature of their crimes.