Jimmy Pesto, Sr. had appeared as a rival to Bob and the possible main antagonist in Bob's Burgers. He runs a place that cooks Italian food and dominating the restaurant business. In one episode, he won't let Bob invite his son (Jimmy Pesto Jr.) to Tina's party unless he shaves his mustache.
In the episode "Burger Boss", Jimmy Pesto is one of the main antagonist of the episode (the other being Tyler and his dad). He had beating Bob's high score in the game, called himself Bob Sucks (as Bob Sux) and teased Bob and and think he's better than him. He was a former member of a yacht club.
- It appears in "Weekend at Morts", that he's good friends with Hugo the Health Inspector.