A five-year Dunder-Mifflin veteran, Jim insists the job is just an extended stop on the path toward his career and he has stated (albeit casually) that he would move to Maryland and take up a better job if it were not for receptionist Pam. His relationship with Pam is occasionally the subject of office speculation, which was particularly uncomfortable when Pam was engaged to Roy Anderson, a Dunder-Mifflin warehouse worker. It was revealed (in a deleted scene) that Jim and Pam went out for lunch together when they first met and had an amazing time, until Jim found out that she was already engaged to Roy. He shared a house with a roommate, Mark, and was recently involved with a purse merchant named Katy but breaks up with her on a company "booze cruise" before revealing his love for Pam to his boss, Michael Scott, who, in an uncharacteristically serious moment, encouraged the dejected Jim to "never give up".
His nonchalant and cynical attitude toward Dunder-Mifflin are manifested by a PlayStation Portable spotted on his desk, his comic deadpan camera mugs in reaction to surprising office developments, and his inciting comments during employee meetings. Jim also loves to pull pranks, the majority of them on deskmate Dwight Schrute. Although occasionally, the success of these pranks lead to inadvertently backfiring on Jim such as "The Alliance" or "The Fight" where Jim's flirtation with Pam gets physically awkward; or "Conflict Resolution" when his prank involving an I.D. badge pushes Dwight over the edge and demand that Michael seriously fire Jim or transfer him out of the Scranton office. Jim purchases a non-refundable ticket for an Australian vacation knowing the date overlaps with Roy and Pam's summer nuptials. After realizing that he wasted a lot of time playing pranks on Dwight, he investigates a transfer to Dunder-Mifflin's Stamford office.
Jim has confessed his love for Pam and kisses her on the season two finale "Casino Night". However, Pam, still intending to marry Roy, turns Jim down. At the start of season three, Jim has already transferred to the Stamford office and is even promoted. He earns the nickname "Big Tuna" from his coworker Andy Bernard (because Jim brought a tuna sandwich to lunch the first day). Jim has trouble fitting in—his pranks elicit extreme anger, some think that he sucks up to management, and no one understands why he always reacts to surprising developments by looking at the camera. He even casually confesses that he misses the atmosphere of the laidback Scranton office in favor of the supposedly more rigid Stamford branch. The supposed rigidity of the Stamford branch is called into question in the episode "The Coup" as the majority of the action shown in the Stamford branch during this episode revolves around staff at the Stamford branch playing the online game Call of Duty during work hours, and Jim's ineptitude at the game. His relationship with coworker Karen Filippelli, however, has grown into the two of them dating.
Jim drives an early 00's Toyota Corolla. His favorite food is soft-shell crab, but he eats a ham-and-cheese sandwich nearly every lunchtime at the same breakroom table. He even orders the meal when being treated to lunch at Hooters. However, the deleted scenes from the episode "Diwali" on NBC.com reveal that he likes sushi, favoring eel over tuna, much to the surprise of Andy.
When Jim meets up with Michael at a paper distributors' convention, he says Michael was a "great boss" and admits that he only transferred because of Pam. Michael considers Jim his best friend after this. When Jim found out that his Stamford boss Josh Porter accepted a job at Staples, therefore dooming the Stamford branch and putting most of the employees out of work, Jim muses to the camera during an interview: "Say what you will about Michael Scott, but he would never do that."
Jim was about to be named Assistant Regional Manager of Dunder-Mifflin Northeast, a new division that would have been created had Stamford absorbed Scranton. However, with Josh's departure, Scranton absorbed Stamford instead. Jim is still offered the promotion but he must relocate back to his old office. Jim is at first unwilling to return to Scranton because of Pam, but finally decides to do so. Karen, who admits in private that she likes Jim, goes to Scranton as well, along with a few other Stamford employees.
Jim and Pam's reunion is awkward. On his first day back, it is obvious that Jim has grown much closer to Karen during his time away. He implies to Pam that he is seeing someone, which is eventually revealed to in fact be Karen. Although on the surface, he truly seems to enjoy being with Karen, Jim vaguely hints during a conversation with Michael that he's not really interested in Karen and he's only in the relationship to avoid dealing with having his feelings hurt by Pam.
As he settles back into Scranton, Jim isn't surprised at all to once again be subject to Michael's immature actions. Jim was still promoted to Assistant Regional Manager, which was the job (and title) Dwight always wanted. But despite how he seems to have "evolved," claiming that pulling pranks would send him back to his old slacker lifestyle, it seems that Jim is settling back into his old ways by focusing his pranks on Andy Bernard, a new co-worker from the Stamford branch, as well as Dwight. After Dwight's departure, as Andy began to suck up to Jim and Michael to greater degrees, Jim decided to pull a prank on him. Karen and Ryan declined to participate, and so it was conducted with Pam. Not only did the prank lead Andy to lose control of himself and punch a hole into the office wall, possibly losing his job, but it also lead Karen to confront Jim about Pam (she previously learned of their past from Phyllis). Jim admitted to still having feelings for Pam. Although Jim later dismisses this through a series of talks with Karen. It's also later on that Pam asks Ryan to set her up with one of his business school classmates in front of Jim, who has a visibly fretful expression when he sees her say this. In Phyllis' Wedding, Jim hints that he would be interested if, hypothetically, Pam is interested in him. Unfortunately, Jim sees Pam leave the reception with Roy in hand, and adds "Here's a nonhypothetical. I'm really happy I'm with Karen."
Encased Dwight's stapler in Jell-O. ("Pilot") Encased Michael's 'World's Best Boss' coffee mug in Jell-O. ("Pilot") Changed Dwight's assigned "race" from "ASIAN" to "DWIGHT" in a game created by Michael where employees wore a card on their head with differing races, and each had to try to guess their own race by the way their co-workers treated them. ("Diversity Day", deleted scene) Locked Dwight inside his own "work space". ("Health Care") Assisted Pam in preparing a list of absurdly fake ailments during Dwight's dictatorial reign over the office's health care plan. ("Health Care") Agreed to participate in an "alliance" with Dwight, which resulted with Dwight being voluntarily packaged in a box in the warehouse and dying his hair blond in order to spy on the Stamford branch. ("The Alliance") This prank backfired when Roy caught Jim with Pam. Convinced Dwight to purchase a purse from a vendor ("Hot Girl"), and then made fun of him for having it (deleted scene). Found Dwight's wallet in the parking lot, and decided, on Pam's suggestion, to give the wallet back to Dwight intact and unchanged. Dwight suspiciously cancelled all his credit cards. ("Office Olympics", deleted scene) Posted Dwight's résumé online and impersonated Michael Scott when a prospective employer called for a reference. ("Halloween") Relocated Dwight's desk to the men's restroom. ("The Fight") Popped Dwight's fitness orb. ("Performance Review") Convinced Dwight a Thursday was a Friday, leading to Dwight's tardiness on the following day. ("Performance Review") Placed Dwight's wallet and desk items in the company vending machine, which Dwight had to buy back with a bag of nickels. ("Booze Cruise") Convinced Dwight to give a "Salesman of the Year" award speech patterned after a speech by Benito Mussolini ("Dwight's Speech") The prank backfired; the speech was a success. Paid coworkers five dollars to call Dwight "Dwayne" for an entire day. (Mentioned in "Conflict Resolution") Convinced Dwight an abandoned infant was in the women's restroom, causing him to walk in on Meredith "on the can." (Mentioned in "Conflict Resolution") Created a macro causing Dwight's name to read "diapers" when input on Dwight's own PC. (Mentioned in "Conflict Resolution") Replaced Dwight's writing instruments with crayons. (Mentioned in "Conflict Resolution") Incrementally increased the weight of Dwight's telephone handset using nickels, then abruptly decreased the weight, causing Dwight to smack himself in the face with the phone. (Mentioned in "Conflict Resolution") Placed a bloody glove in Dwight's desk and attempted to convince him that he had committed murder. (Mentioned in "Conflict Resolution") Labeled Dwight a security threat on an oversized identification badge and typed "Fart" as his middle name. ("Conflict Resolution") Moved Dwight's desk two feet closer to the copier by moving it about an inch every time Dwight went to the bathroom. (Mentioned in "Conflict Resolution") Encircled Dwight's desk in police tape, then arranged for Dwight's phone to ring, leaving Dwight unable to answer the phone because it would require him to cross the police tape. ("Conflict Resolution", deleted scene). With the help of Pam, convinced Dwight that he (Jim) had telekinetic powers. ("Casino Night") Held Dwight's bobblehead doll for $5 ransom. (Third Season Primetime Preview) Encased Andy's calculator in Jell-O. ("Gay Witch Hunt") This prank backfired when Andy reacted violently. Convinced Dwight (and Michael) that gaydar was a genuine device and ultimately sent a hand-held metal detector decorated with "gaydar" branding, causing Dwight to panic when the "gaydar" went off as he inadvertently scanned himself. ("Gay Witch Hunt") Gained access to Dwight's hotel room at a paper convention in Philadelphia. Jim abandoned his prank when he caught a glimpse of what he thought was a hooker in Dwight's room. ("The Convention") Made high-pitched noises with Pam hoping Dwight would schedule an appointment with an ear doctor. Pam called it "Pretendinitis." (Mentioned in "The Coup") Sent faxes signed "Future Dwight" on Dwight's own stationery, such as one warning that the coffee is poisoned, causing Dwight to run and "save" Stanley from drinking the coffee. ("Branch Closing") Stared at Dwight's forehead, causing Dwight to think something was on his forehead. ("The Merger") Gave Andy wildly incorrect "tips" on winning Pam's affections. ("The Convict") Ordered fifteen large sausage pizzas to the office under the name 'Dwight'. When they arrived Dwight was forced to pay for all of them("The Convict" Deleted Scene) Told Dwight the CIA wanted him to go on a secret mission, getting him to wait on the roof for a helicopter and destroy his cell phone ("A Benihana Christmas") Told Dwight that their waitress suffered from narcolepsy and couldn't remember how to butcher a goose. Dwight then graphically explained the procedure, to her shock. ("A Benihana Christmas") While Dwight tape recorded a meeting for Michael, Jim said out loud that Dwight was completely nude, save for a baby bonnet and an Animal (from the Muppet Babies) tattoo on his stomach, holding a plastic knife to Stanley's neck. ("Back from Vacation") Glued Dwight's desk drawers together. (Mentioned in "Back from Vacation" deleted scene) Changed Dwight's voicemail so his voice sounded like a chipmunk. (Mentioned in "Back from Vacation", deleted scene) Told Dwight they had a meeting at 4am, and he was the only one that showed up. (Mentioned in "Back from Vacation", deleted scene) Shipped Dwight's desk by mail to Roswell, New Mexico, where Dwight was vacationing. (Mentioned in "Back from Vacation", deleted scene) Hid Andy's cell phone in the ceiling above his desk, and then, along with Pam, called it repeatedly. ("The Return") This resulted in Andy punching a hole in the office wall. Instead of hiring a male stripper at Michael's request, hired a Benjamin Franklin impersonator. ("Ben Franklin") Attempted to convince Dwight that the Ben Franklin impersonator was the real Franklin. Dwight claimed he was 99% sure Jim was lying, but extensively quizzed the impersonator on Franklin and contemporary trivia. ("Ben Franklin") Conditioned Dwight to expect an Altoid mint each time he heard a computer chime by offering Dwight a mint, imitating the Pavlov's Dogs Experiment. ("Phyllis' Wedding") Manipulated Dwight into patrolling for wedding crashers. ("Phyllis' Wedding") Convinces Dwight that he (Jim) is turning into a vampire after being bitten by a bat. ("Business School")
Pam broke his heart. Jim thinks he likes Karen.
Nicknames for Jim
|The Dundies||Fat Halpert||Michael||Fat Albert|
|The Secret||Jim-bag||Michael||Gym bag|
|Gay Witch Hunt||Big Tuna||Andy||Jim had a tuna sandwich|
- Jim loves Pam.