Survivors Guilt: In "The Job" Frank admits to feeling some over the fact that some of his other former cop friends became ill from chemical exposure experienced during and 9/11.
"Why them and not me?"
To Be Lawful or Good: A recurring plot is Frank being forced to choose between his legal responsibilities as police commissioner and his desire to do what is morally right. He's extremely good at finding the third option that allows him to do both.
Played by Len Cariou
Great-grandpa of the Reagan family. Was a hardbitten Da Chief in his day; now dispenses wisdom and advice.
Badass Grandpa: Oh yeah. When Frank is shot, he's the one sitting in the hallway, up all night alert, ready to protect his family.
Cool Old Guy: Is this to his grandchildren and great-grandchildren. Also, due to being an honest cop and not taking any shit, has the eternal respect of the NYPD rank and file.
Cowboy Cop: Henry seems to indicate that he was a Cowboy Cop in his time. Of course back then there was more "flexibility" in what was allowed anyway.
Glory Days: Sometimes longs for the days when life was simpler and you could be a cowboy cop.
Good Old Ways: Generally tends to be older fashioned, but with one subversion: he advises Frank to switch to an automatic instead of a revolver, for more firepower.
Ambiguously the eldest of the Reagan siblingsnote it's either him or Erin, and the series has not cleared it up yet, though the Season 3 premiere has him referring to her as his baby sister, Danny is a police detective assigned to Manhattan. He is Happily Married and has two sons.
Cowboy Cop: He bends the rules in pursuit of justice. Although he's also been known to bend them the other direction (i.e. coaching an illegal immigrant on how to frame his confession to manslaughter for sympathy).
Jerk with a Heart of Gold: Generally behaves like a jerk towards his youngest brother Jamie; Frank explains to Jaime that it's because Danny can't bear the thought of losing another brother, so he tries to Stealth Mentor him.
Knight in Sour Armor: Generally sour towards the world in general, but gets up every morning to make New York a better place because he loves this city.
Married to the Job: Much to his actual wife Linda's chagrin, and often a source of tension when Danny has to leave his family's side to go out on a mission.
The youngest of Frank Reagan's surviving children, and a rookie cop. A Harvard Law graduate, he changed his mind about being a lawyer and joined the NYPD partly because of his dead brother Joe, and partly because he wanted to help people more than he wanted to make money.
By-the-Book Cop: Very much so; this is part of the tension between him and Danny.
Chick Magnet: Put Jamie in the same room with almost any woman his age (minus Erin, naturally) and she'll be cooing over him before long.
He starts the series with Sydney, later attracts Laura (a witness he had to guard), then attracts Bianca, a Mafia Princess.
If Erin can be believed, he sets all the female paralegals in the DA's office a-twitter as well.
Swallow the Key: Frank Reagan didn't raise no fools. When confronted by some mob brokers, Jamie hastily swallows the thumbdrive he used to hack into their finances.
Took a Level in Badass: When the Sanfinos put out a hit on his alias and on Noble, he saved Noble's life again and coolly talked him into testifying.
Played by Bridget Moynahan
Frank's daughter and Danny's and Jamie's sister, she is an Assistant District Attorney for Manhattan. She was married to a defense attorney, but they divorced before the series began and she is now a single mom. Her daughter Nicky recently raised her ire by deciding she wants to be the first female Reagan to become a cop.
Amicable Exes: Downplayed with her ex-husband Jack Boyle. They're reasonable but rather curt with each other, and the first time we meet him, Jack wonders why Erin still has her married name "Reagan-Boyle" on her door. She says it's the same reason people who have lost weight keep a "before" picture. Ouch. However, they still trust each other enough that Erin calls Jack to represent Danny after he gets framed.
All Girls Want Bad Boys: Erin gets weak in the knees when she meets art aficionado "Frank Weller." And she gets even weaker when he turns out to be an art thief (albeit one who returns art stolen by the Nazis during World War II to its rightful owners) who is using a fake alias.
Fanservice with a Smile: In her teens, Erin worked as a roller-bunny at a cocktail bar (specifically Roxy's). Frank was apparently aware of it (his mustache twitches in amusement at the memory) but he let it slide.
Glamorous Single Mother: Averted. Erin expertly juggles work and her teenage daughter, but has little time left for a social life.
Principles Zealot: Is strongly committed to her principles and the law, and doesn't like Danny's cowboy cop tendencies. She has been known to bend on occasion, though.
Taking the Kids: Erin got Nicky after divorcing her husband, a defense attorney.
Nicole "Nicky" Reagan-Boyle
Played by Sami Gayle
Erin's daughter. She recently decided she wants to be the first female Reagan to join the NYPD. Her mom was thrilled.
Adorably Precocious Child: She's in middle school, but dresses and behaves like a thirty-two year old. She isn't cowed by any of the Reagans, regardless of age, and seems to view herself as the matriarch of the family.
Disappeared Dad: She knows exactly where her dad is, but he usually takes little-to-no interest in his daughter's life. Erin and the rest of the Reagans are not amused. Henry refuses to shake Nicky's father's hand when they run into him at a party, and Frank bluntly tells him "You walked away from two of the most wonderful women I've ever known."
Jamie's training officer and partner through season 2. Recently took public credit for a rescue performed by Jamie in order to keep the latter's face out of the press for the benefit of the Sanfino undercover operation.
The Power Of Trust: Danny's wife doesn't even seem to blink an eye at them being partners. In fact, a couple exchanges when she visits the Reagan house indicate they're friends (including giggling over the outfit Jackie wears once while undercover as a prostitute to catch a Serial Killer).
Beware the Nice Ones: Baker is generally a quiet, efficient and demure personal assistant, who deftly manages Frank's schedule. She is also an NYPD detective, and whenever Frank needs dirt dug up, she delivers.
No Name Given: She's only ever addressed by her surname in-universe. Promo materials have confirmed her given name as Melissa.
Office Lady: Much of her role — until Frank needs a quiet investigation, at which the viewers are reminded that Baker is not just an office lady, she's also a detective.
Played by Eric Morris
While in plainclothes at a bar during the Season 2 premiere, Jamie Reagan saved a young man's life from an accidental overdose. The guy turned out to be Noble Sanfino, the heir to a major crime syndicate. NYPD's Organized Crime division parlayed Jamie's brownie points into an undercover assignment for the rookie cop.
Sleazy Politician: Downplayed. He is not very sleazy but he does think like a politician and sometimes cuts corners in morality especially in the eyes of the more straitlaced Frank. Also he sometimes thinks to much about Nepotism toward his original constituents rather then thinking in terms of the whole city. In a way he is a more modernized and respectable version of a traditional New York ward boss.
Also, while he does clash often with Frank, at the core both of them are Not So Different: they both want what's best for the city of New York, it's just that they disagree on how to get there. As an example, both of them are concerned over terrorist threats, but Frank would rather work quietly and keep things off the news, while Poole would warn the whole world, partly because he doesn't want to be seen as someone who did nothing, but also because he is genuinely concerned for his city.