Andy Samberg as Detective Jacob "Jake" Peralta, a talented but childish detective. It is revealed that his father abandoned him and his mother when he was very young. Peralta shows "class clown" traits, constantly pulling pranks and making jokes at the expense of his colleagues, particularly his partner Santiago; this is later revealed to be secret romantic feelings for her, which he confessed to her in the first season finale. Despite his fun-loving traits, Peralta has the best arrest rate in the precinct. His frequent disregard for decorum and protocol regularly puts him at odds with the by the book Captain Holt, though the two eventually develop a mutual professional respect for each other. The show has made hints that Peralta is at least half-Jewish.
Andre Braugher as Captain Raymond "Ray" Holt, the 99th Precinct's strict new Commanding Officer. Holt is known for his cold and robotic manner of speaking and lack of outwardly visible emotion, despite this he is nonetheless a very supportive commander to his detectives, this was evidenced by his moral support to Jeffords over his nervousness and forcing Gina to take on the role of his PA due to the fact that he is aware of her hidden talents. The Nine-Nine is Holt's first command despite many years of outstanding service, something he attributes to prejudice against his homosexuality as he came out in 1987 and until recently led a group that supported gay African-American NYPD members. Holt is married to Kevin Cozner, a university professor.
Melissa Fumero as Detective Amy Santiago, Jake's uptight, by-the-book, rule-following, and overachieving partner. She is continually trying to ingratiate herself with Captain Holt. She has a competitive nature stemming from having seven brothers. Amy plays by the book frequently exasperated by Jake's childishness, as well as the ease with which he succeeds as a detective. Santiago clandestinely smokes at times to relieve stress and is highly allergic to dogs. It is revealed that she skipped the fourth grade. She is unaware of Jake's feelings for her until Charges and Specs, the season one finale, when Jake confesses that he wishes something romantic could happen between them.
Joe Lo Truglio as Detective Charles Boyle, a nervous, clumsy but honest and hard-working detective who has a crush on Detective Diaz. He is divorced from his wife, who had numerous affairs during their marriage, to the point where she has to pay alimony to him. He is also a huge, unapologetic foodie, maintaining a weekly Brooklyn pizza-ranking email and often relishing bizarre foreign cuisine that disgusts his coworkers. For saving Detective Diaz's life during the Christmas episode, he was awarded a Medal of Valor in "The Bet" episode, though he was overshadowed by a revered and heroic NYPD horse named Peanut Butter. He was engaged to a lovely university professor in Season 1 but they broke up when he admitted he could not leave his job and move with her to Ottawa.
Stephanie Beatriz as Detective Rosa Diaz, a smart, tough, and mysterious detective. She attended parochial school, later studied ballet, and was a classmate of Jake's in the police academy. Though Diaz is a loyal and effective member of the squad, her anger management issues and lack of empathy terrify most of her coworkers. She is highly secretive about her personal life. She spent most of Season 1 shooting down or otherwise dodging Det. Boyle's clear interest in her, and was supportive and happy for him when he began dating someone else.
Terry Crews as Detective Sergeant Terence "Terry" Jeffords (Jeffries in the Pilot episode), the detective squad's leader. An avid bodybuilder, Terry is devoted to his wife and two young daughters, and fears the danger of police work because of the possibility that he could leave his children fatherless. Following a panic attack prior to the show's run, Terry was removed from field work, but has since cautiously returned. He is high-strung and prone to nervous excitement, but is an effective and caring leader to the detective squad. It is revealed in the series pilot episode that Terry was seriously overweight prior to his bodybuilding obsession. He eats enormous amounts of healthy foods (especially chicken and yogurt) to keep in shape, and has a brother-in-law (played by real life ex-NFL player Jamal Duff) who regularly mocked Terry as weak and soft, only to become visibly impressed when Captain Holt mentioned Terry's (possibly non-existent) arrest of a large group of Russian Mafia members.
Chelsea Peretti as Administrator Gina Linetti, the 99th Precinct's sardonic administrator and Captain Holt's assistant. Despite normally maintaining a clueless and dimwitted disposition most of the time, she can also be surprisingly observant and has shown traits of being more intelligent than she likes to show. She belongs to a dance troupe called "Floorgasm". She has displayed a penchant for kleptomania, extreme narcissism, specifically sharp, confused intellect, financially savvy, but is generally regarded as harmless yet annoyingly aloof by the rest of the staff. She is also childhood friends with Jake, who got her the job at the precinct.
Dirk Blocker as Detective Michael Hitchcock (season 2, recurring season 1), an enthusiastic but clueless detective who is friends with Detective Scully. He is prone to taking his shirt off at inappropriate times. He went bald at 15.
Joel McKinnon Miller as Detective Norm Scully (season 2, recurring season 1), a middle-aged, lazy and overweight desk worker. Scully shows talent as a tenor opera singer and "make[s] great coffee", according to Sgt. Jeffords. He used to date Hitchcock's wife. Scully routinely discloses disgusting medical issues like the entire bottom of his foot being a wart.
Patton Oswalt as Fire Marshal Boone, the dimwitted fire marshal of the local fire station precinct. He hates the detectives of 99 intensely, but reaches an understanding with Jake when they discover that they both were abandoned at a young age by their fathers.
Dean Winters as Detective Warren Pembroke, a detective for the Major Crimes Unit notorious for taking over cases that are nearly solved and getting all of the credit for finishing them, which earns him the nickname "The Vulture".
Marilu Henner as Vivian Ludley, a food author who becomes romantically involved with Boyle. In "Full Boyle", she and Boyle become engaged, until she broke it off in "Charges and Specs" when she wanted to move to Canada and Boyle was not willing to do so.
Fred Armisen as Mlepnos, a confused foreign man living in a building where a murder took place. The detectives run into Mlepnos while searching for witnesses, showing him a photo of the victim, which he keeps. He shows up again in "Operation: Broken Feather".
Kyle Bornheimer as Detective Teddy Wells, a detective at another precinct who used to date Amy and resumes his relationship with her after meeting up with her at a training exercise.
James M. Connor as Deputy Commissioner Podolski, is the NYPD's arrogant deputy police commissioner who uses his position for his own personal means such as keeping his rebellious son, Trevor, out of jail in "The Tagger".
Michael G. Hagerty as Captain McGinley, the 99th Precinct's previous Commanding Officer, who was fired for his ineptitude and his permissive attitude toward the disruptive antics of Jake and his colleagues.
Andy Richter as a rude doorman who refuses to assist Jake during a routine questioning.
Stacy Keach as Jimmy Brogan, a crime writer from the 1970s whom Jake greatly admires. Brogan is revealed to be homophobic, vengeful, and manipulative, disillusioning Jake and leading to a physical altercation between the two, but also showing that Jake respects Captain Holt (Jake punched Brogan for slurring Holt, and Holt was impressed by not only this but when he learned Jake took blame for the fight to keep Holt's good name out of Brogan's rotten writing).
Kid Cudi as Dustin Whitman, a perpetrator Jake arrests on suspicion of burglary. Mocks Jake by calling him "Joke Peralta" and relishes how Jake put himself on a desperate 48-hour clock when he was arrested without enough evidence to make charges stick, but learns to his regret that he underestimated Det. Peralta's ability.
Craig Robinson as Doug Judy a.k.a. "The Pontiac Bandit", a thief and forger who escapes from Peralta and Diaz by pretending to have information on a different man who Peralta believed to be the actual 'Pontiac bandit'.
Marc Evan Jackson as Kevin Cozner, Holt's husband who dislikes the NYPD due to their treatment of Holt and his homosexuality during his earlier years on the force, but thaws a little when Jake smartly figures this out and honestly says the 99th likes and respects Holt. He claims Holt is the "funny" one in their relationship.
Brooklyn Nine-Nine has received positive reviews from critics. As of January 2014[update], Rotten Tomatoes gives it a score of 88% based on 49 reviews, with the consensus, "Led by the surprisingly effective pairing of Andy Samberg and Andre Braugher, Brooklyn Nine-Nine is a charming, intelligently written take on the cop show format."Metacritic gives the show a weighted average rating of 70/100, based on 33 reviews, indicating "generally favorable reviews".
The show simulcasts with Fox on City in Canada. In the UK on E4 from January 2014 and RTÉ Two in Ireland. In Poland on Canal+ from Thursday January 23, 2013 at 9 pm. In New Zealand on TV2 from Monday February 13, 2014 at 9 pm and is currently airing from Monday to Wednesday on Comedy Central in India. In Australia Brooklyn Nine Nine on SBS from Monday July 28, 2014 at 9:30pm.