Sheriff Harry S. Truman
The upstanding Sheriff of Twin Peaks at the time of the original series.
- Agent Scully: Though at first he seems to be set up for this, Sheriff Truman deeply respects Agent Cooper. However, when evidence seems to point at Ben Horne Truman expresses exasperation with Cooper's eccentricity, in this case Cooper was right.
- Drowning My Sorrows: He does this after Josie "dies". Although he gets better in the next episode.
- Fair Cop: Michael Ontkean was a very handsome man during the original series' run.
- Fatal Flaw: His usual reasonableness tends to go out the window when Josie's involved and his devotion to her frequently sends him in the wrong direction.
- Generation Xerox: The Secret History of Twin Peaks reveals that Harry's father, Frederick, also served as Twin Peak's sheriff and was a member of the Bookhouse Boys. It is actually slightly played with, as originally, Harry's older brother, Frank, took over as sheriff after their father, while Harry took up a job as deputy under him. After getting married, Frank would eventually transfer to law enforcement job in western Washington to where his wife's family resided, while Harry took up the mantle of sheriff to continue the family tradition.
- Heroic BSoD: As mentioned under Drowning My Sorrows, he has one after Josie supposedly "dies".
- Jurisdiction Friction: None, with Sheriff Truman going so far as to describe Agent Cooper as "The finest lawman I've ever known". There is a little formal stiffness initially, but that's settled by the second day and has more to do with meeting someone new.
- The Lancer: Gets put into this role in place of Jurisdiction Friction.
- Meaningful Name: There seems to be significance to the fact that he's named after the president who dropped the atomic bombs on Japan.
- Mr. Fanservice: One of the most handsome men in the cast along with Agent Cooper and Hawk.
- Named After Somebody Famous: His name being Harry S. Truman is the result of his father being a very patriotic World War II veteran. Harry's older brother, Frank, is similarly named after Franklin D. Roosevelt.
- Name's the Same: Invoked:Cooper: I'm supposed to meet with a Sheriff Harry S. Truman. Shouldn't be too hard to remember that.
- Nice Hat: Par for the course, this sheriff has a cowboy hat. (It's a little out of place for the region - Eastern Washington State has the sort of climate and culture that would justify owning one, but on the west side of the Cascades the only reasons to wear one are style and as part of a uniform.)
- Put on a Bus: In Season 3, due to illness (really Michael Ontkean declining to return). A conversation Frank has with him on the phone implies that he has terminal cancer.
- Reasonable Authority Figure: Makes it a point to help out Cooper wherever he can. Makes sure to give everyone a fair hearing.
- The Sheriff: As per his rank.
- The Watson: Lampshaded by Harry himself in the first episode after the pilot when he mentions feeling "a bit like Dr. Watson." He's as competent as any other lawman, but is out of his depth with the Palmer case (and subsequent happenings) and knows it.
Deputy Andy Brennan
The naive and pleasant deputy of Twin Peaks Sheriff's Office. He is romantically involved with Lucy.
- The Big Guy: Shared with Hawk.
- Butt-Monkey: When he steps on a plank and it bonks him on the head, you begin to wonder if the universe really has it in for him....
- Clueless Deputy: Bless his heart, he really tries. But he's still The Ditz.
- The Ditz: Most of his time is spent doing pratfalls.
- Doting Parent: He and Lucy are this to Wally.
- Dumbass Has a Point: He's the one that figures out the map to the Black Lodge, though it takes him a while to figure out how to explain it to the others.
- Good Is Dumb: Andy's a good-hearted person, even if he isn't the brightest bulb on the tree.
- Gossipy Hens: A Rare Male Example. Hawk notes in The Secret History of Twin Peaks, that Andy knows a lot more about the people in town than he lets on and doesn't need much prodding to tell a story or two about them. When he questions Andy about how he knows so much, Andy sheepishly replies that people seems compelled to come to him with their secrets, though he doesn't fully understand why.
- Happily Married: Twenty five years after the original series, Andy is married to Lucy having raised their son Wally.
- The Heart: For the Twin Peaks Police Department.
- Hidden Depths: The composite sketch he does of BOB according to Sarah Palmer's description demonstrates that he is actually a pretty competent artist.
- Inelegant Blubbering: In a variation on the Vomiting Cop trope, Andy starts weeping inconsolably whenever he is confronted by gruesome sights.
- InfoDump: After Andy is transported into the White Lodge while investigating Major Briggs' notes with the other Twin Peaks officers, the Fireman seems to fill in Andy on several important bits of plot.
- Lovable Coward: Fortunately, he shakes off the cowardice when saving Harry from getting shot.
- Older and Wiser: By The Return he seems to handle himself as a police officer much better, displaying confidence and asserting his control in certain situations. The aftermath of his brief visit to the the White Lodge also exhibits this trope.
- One Head Taller: Than his love interest Lucy.
- Simpleton Voice: He talks a bit like a toddler as an adult with very slow pronunciation and simple concepts. Despite this, he's fully capable of doing his job.
- Who's Your Daddy?: Is he the father of Lucy Moran's child? We don't find out, but Lucy decides that, since Brennan would make a better father than Dick Tremayne, she will marry him.
- Will They or Won't They?: With Lucy for most of the original series. They Do by The Return.
Deputy Tommy "Hawk" Hill
The Native American Deputy for the Twin Peak's Sheriff's office and right hand man of Sheriff Truman.
- Badass Native: The only native American on the force and also one of the best fighters.
- Big Damn Heroes: In The Orchid's Curse Hawk follows Cooper and Truman when they raid One Eyed Jacks. The two almost escape until a thug holds them up at gunpoint, whereupon Hawk reveals himself and lands a knife in the man's back.
- The Big Guy: Shared with Andy.
- Fair Cop: He's an attractive man and ages gracefully over the course of the Time Skip.
- The Ghost: His veterinarian girlfriend.
- Magical Native American: Of course, in Twin Peaks, his beliefs are downright mundane. The Secret History of Twin Peaks has him expressing his annoyance with being associated with this trope on more than one occasion.
- Mr. Fanservice: Hawk is considered by many female fans to be the most attractive man in the series after Agent Cooper. The camera also loves him.
- Number Two: Most of the series has him as back up to Sheriff Truman.
- Odd Friendship: Twenty five years after the original series, Hawk seems to have established a pleasant friendship with the Log Lady.
- Rank Up: Twenty five years later, Hawk is Deputy Chief to the Twin Peaks Police Department.
- Scarily Competent Tracker: Both Truman and Cooper often ask him to track down suspects and other people of interest, and he usually delivers pretty quickly. It says something about a person if he is unable to find them.
The secretary for the Twin Peak's Sheriff Office. She is romantically involved with Andy and Dick Tremayne.
- Big Damn Heroes: In Episode 17, she manages to save Sheriff Truman and kills the Doppleganger Cooper when they discover it isn't the actual Cooper.
- The Chick: The girl on the force, and is generally quite a sweetheart.
- The Cutie: Nearly everything about her. Particularly her mousy voice, her pout, and general air of vulnerability.
- Doting Parent: She and Andy are this to her son Wally Brando in The Return. The two of them practically squee in delight when they learn that Wally has stopped by to visit the Twin Peaks Sheriff's Department.
- The Ditz: She's a bit flighty, but her squeaky voice really magnifies it.
- Happily Married: Season 3 opens twenty five years later with Lucy married to Andy as Lucy Brennan.
- Innocent Bigot: (dramatically stated to Hawk) "You're an INDIAN."
- No Object Permanence: Demonstrates this in The Return. She struggles with the concept of mobile phones and Sheriff Truman making it to the office while supposedly being in the mountains. In another scene, she obsesses over what happens to the thermostat when she's not around.
- Sassy Secretary: Usually not very sassy (except when she has to deal with Andy's cluelessness or Dick's antics; then she really turns up the sass), but all the other stereotypical secretary traits (nasal, watches soap operas).
- Will They or Won't They?: With Andy for most of the series. They Do by The Return.
- Womanchild: That voice. That pout.
Sheriff Franklin "Frank" Truman
Sheriff Harry S. Truman's older brother and ex-ex-Sheriff of Twin Peaks. Reinstated as co-Sheriff with Harry during the Time Skip.
- Canon Immigrant: Frank was first mentioned and given a backstory in The Secret History of Twin Peaks.
- Henpecked Husband: A very patient and understanding version. His wife Doris lays into him every time she shows up at his office, but it's heavily implied to be the result of emotional stress from their son's suicide. Frank reacts calmly to her outbursts because he knows what she's going through.
- In Episode 6, a couple of his subordinates are even seen giving each other "sucks to be him" looks.
- Innocent Bigot: According to The Secret History of Twin Peaks, he gave Hawk his nickname, which Hawk admits to finding condescending. While the nickname stuck, Hawk largely considers the incident a case of Values Dissonance that Franklin grew out of.
- Mandatory Unretirement: For whatever the reason, he chose to return to the Twin Peaks Police Department.
- Outliving One's Offspring: Apparently his son committed suicide as a result of PTSD.
- Remember the New Guy?: Never mentioned in the original series, but he appears as the new Sheriff while Harry is sick.
- Secret History of Twin Peaks mentions that Frank was Sheriff of Twin Peaks before marrying his wife and becoming law enforcement in Western Washington until Harry became sick.
- Retired Badass: He served as a Green Beret during the Vietnam War.
- Suspiciously Similar Substitute: Fills the same role in the department as Harry Truman did, and even dresses the same. The character was created because Michael Ontkean declined to come out of retirement to play Harry Truman.
- Unfazed Everyman
A noticeably impolite and also somewhat morally crooked employee of the Twin Peaks Sheriff's Department. Something of a jerkwad to, well, everyone.
- Deadpan Snarker: At first, but crosses the line into more severe territory down the road.
- Dirty Cop: Is hopelessly corrupt and willing to accept bribes.
- The Friend Nobody Likes: Well, coworker. But really, there are some good reasons no one likes him unless he accepts a bribe from them.
- Hate Sink: His comments about the death of a disabled veteran are less than endearing.
- Jerkass: Makes fun of a suicidal PTSD victim, and is a Dirty Cop to boot.
- Jerk with a Heart of Jerk: There's one episode where he comes across as reasonably polite to Lucy and everyone else in the conference room. In his next appearance, he takes a bribe from Richard.
- Manchild: Has apparently been working at the Twin Peaks Sheriff's Department for a while, but with his whiny attitude that resembles a Mouthy Kid it's real a wonder he hasn't been canned yet.
- Meaningful Name: In internet slang, "Chad" has become a synonym for a guy who acts like a jerk. He sure is that.
- Never My Fault: Whines repeatedly when reminded of his rudeness by his senior colleagues.
- Not-So-Harmless Villain: Downplayed. Outside of being an ass, Chad's just a pathetic, ineffectual weenie who's far too lazy to do his job and largely comes off as a far less threatening Richard Horne. That said he's more adept at being a Dirty Cop and shows a lot more skill at skirting the law than enforcing it. He even kept a jail key in a hollow part of his shoe on the chance he would be arrested.
- Reality Ensues: He is nowhere smart enough to keep his corruption a secret, and eventually ends up being arrested by his colleagues who turned out to have been keeping tabs on his illegal activities all along. The Final Dossier reveals that he has ultimately ended up in federal custody, awaiting trial on a variety of charges, in large part for his prominent role in an international drug-running operation.
- Weasel Coworker: Always shown mouthing off instead of doing actual work, except when he goes into Dirty Cop mode off the record.
The dispatcher for Twin Peaks's police department having gained employment at some point during the time skip.
- Cool Old Lady: Maggie's largely treated as a professional and friendly coworker. Sometimes she's played against Chad to highlight how much of an ass he is.
- Mission Control: She's the Dispatcher at Twin Peaks and helps to coordinate the force's deployment.
- The Reveal: Her introduction is used to show how much bigger the Twin Peaks police force has gotten since the original series as well as how much the station's been modernized.
The obstructive and rude Sheriff of Deer Meadow. Agents Desmond and Stanley find their investigation into Theresa Banks's death stonewalled by Cable's uncooperative behavior.
- Ambiguously Evil: While yes he's an Obstructive Bureaucrat, the show doesn't clarify if he's an out and out Dirty Cop. When Theresa Banks's ring goes missing, there's an implication that he might have taken it, but with the supernatural nature of the ring and the fact he never admits to anything, leaves it up in the air if he really did try to take it. Even Desmond finding that ring near Cable's trailer is suspect.
- Dirty Cop: Downplayed. Whether or not he steals jewelry off of dead bodies is up in the air, but the lengths he goes to get in the FBI's way, to the point of challenging their investigator to a fist fight over not wanting to lose possession over Theresa Banks's body, pushes him into this.
- Evil Counterpart: As Deer Meadow is to Twin Peaks, Cable is to Truman. Truman averts Jurisdiction Friction by working well and even befriending Cooper, Cable butts heads with the Feds constantly; Truman is honest, Cable is shifty; Truman is accommodating with good coffee, Cable is uncouth and serves old burnt coffee.
- Jerkass: The most distinguishing trait of his is that he's a dick. He's rude, uncaring, and deliberately impedes the FBI under the egotistical belief that they don't need them.
- Jurisdiction Friction: A classic example. Local cop feels the FBI is muscling in on his investigation and knocks heads with them.
Deputy Cliff Howard
A Deputy in the Deer Meadow Police Department. Like everyone in the department, he's also an asshole.
- Clueless Deputy: He's a lazy goof-off and spends more time taunting the FBI agents than he does doing his job.
- Evil Counterpart: What Cable is to Truman, Cliff is to Andy. He's a Clueless Deputy, but lacks the earnest and likability that Andy has. While Andy may be bad at his job, he's trying while Cliff's too lazy to give a damn. Like Andy, he also seems to have a thing with the secretary and the two often play the peanut gallery to Cable's antics.
- Faux Affably Evil: An interesting case, especially on account of Cliff not really being evil, just a dick. Cliff's excitable and happy, much like Andy, but those mannerisms underscore him jeering and mocking other people, much in the vein of a petulant child.
Detective Dave Macklay
A Detective put in charge of the investigation of Ruth Davenport's death. The case quickly escalates to all manner of strange occurrences that bring the FBI and the Pentagon into his precinct.
- Agent Scully: To contrast Gordon's team, Macklay has no background in the supernatural and is thus completely dumbfounded by all of the happenings in the case.
- Jurisdiction Friction: Averted. While Macklay is quite surprised at the FBI and Military's presence in his case he's nonetheless completely willing to help them out.