The Con Man is an unnamed background character and a short lived antagonist in SpongeBob SquarePants. His name refers to his appearance in the episode, "Chocolate with Nuts" where he conned for SpongeBob and Patrick's money three times. In "20,000 Patties Under the Sea", he said, "Thank you again", indicating that he remembers SpongeBob and Patrick. In that very same episode it is shown he is married some time between "Chocolate with Nuts" and is green in "20,000 Patties Under the Sea".
He is snide and sneaky, as he tricks the duo during the episode "Chocolate with Nuts" three times, The Con Man first cons them by saying that "only professional chocolate salesmen have chocolate bar carrying bags" and of course they need to have them. The second was that they needed "chocolate bar bag carrying bags" to hold all the bags they just bought, and of course they buy them. However, his most successful attempt was faking that he was "born with paper skin and glass bones and a disease" which impacted the duo heavily for two minutes and guilted them into buying chocolate bars from him to fund his medical expenses.
He has three homes in Bikini Bottom as seen in "Chocolate with Nuts". He appears to have a fast way to get around, as he was almost instantly able to switch to his second house right next door to his first, and he possibly has a way of spying on people, as he was able to figure out where Spongebob and Patrick would go during their last con and prepare his trick of being a seriously diseased man.