Nat Peterson works at Snail Po Headquarters and a variety of other places. He was also a member of the Bikini Bottom Music Lovers Club. His last name was revealed in the episode Missing Identity when Sadie Rechid mentioned his name. He is friends with Fred, Harold, and DoodlePants (in Drawn to Life: SpongeBob SquarePants Edition). He seems to be with Martha Smith in various episodes. He told DoodlePants helpful advice of how to defeat DoodleBob. In Artist Unknown, when Squidward welcomes him to art class, he is seen saying, "Oh, isn't this cooking?" He also said he was a better artist than Squidward. Nat Peterson once offered Mr. Krabs $100,000 for the soda drinking hat, and was seen hanging out with Squidward's arch rival from high school, Squilliam Fancyson, suggesting that he is wealthy. In Idiot Box, he is seen on a soap opera giving box for a gift.
In the episode "Plankton's Regular", his most notable appearance, he feigns enjoyment of Plankton's Chum in order to fulfill a deal with Karen, Plankton's wife. He is shown to live in a mobile home, and apparently possesses great acting skills, as he manages to fend off SpongeBob's persistent attempts to give him a Krabby Patty. However, one can foresee the ending when Nat is forced to taste Mr. Krabs' Chum and he proclaims that it is the "second foulest thing he has ever tasted." The audience can infer that the foulest thing is actually Plankton's Chum, and Mr. Krabs has thwarted him in that area of food service as well. At the end of the episode, Nat breaks the news to Plankton and cuts off the deal with Karen, returning the money that she had given him to eat at the Chum Bucket. He is last shown being carted off by medical staff members, which he claims will be the third time he will have visited the doctor on account of Plankton's Chum.