Jim Halpert (John Krasinski) is a paper salesman at the Scranton branch of Dunder Mifflin. He is a good guy, and very intelligent albeit unmotivated. Throughout the four seasons of the show and counting, Jim spends most of his time pining for Pam Beesly and/or engineering pranks at the expense of office-mate Dwight Schrute.
Jim: I don't have a ton of contact with the Scranton branch, but before I left, I took a box of Dwight's stationery, so from time to time I send Dwight faxes. From himself. From the future: "Dwight, at 8am today, someone poisons the coffee. Do not drink the coffee. More instructions will follow. Cordially, Future Dwight."
Dwight: What's your daughter's name again? Pee Pee?
Jim: Pee Pa.