!!DS Ronnie Brooks (Bradley Walsh)

* AffectionateNickname: Often called Matt "Matty", "Matty-boy", or "Sunshine". Fan were NOT pleased when he once referred to Sam by the last one.
* TheAlcoholic
* BadassGrandpa
* BewareTheNiceOnes[=/=]YouWouldntLikeMeWhenImAngry: He's mostly a friendly guy, but like Matt, he has a handful of moments where you realize that ticking him off is a ''bad'' idea.
* BigEater: Frequently seen snacking on various foods. It's even lampshaded by Natalie and Matt's constant teasing and when Alesha is savvy enough to bring him a pastry to bribe him into doing some research for her.
* CartwrightCurse[=/=]DeadPartner: And ''how''--his backstory includes a partner who was killed, Matt's the one who accidentally reminds him of this, eerily {{Foreshadowing}} his own fate, and [[spoiler: DI Wes Leyton (not his partner, but clearly a good enough friend for both of these tropes to apply) is gunned down at the beginning of the episode "Hard Stop"]].
* CoolOldGuy
* CunningLinguist: Speaks French.
* DeadpanSnarker: Not as much as his US counterpart, and it drops off noticeably after [[spoiler: Matt is killed]], but still there.
* DecemberDecemberRomance: In "Honor Bound", we learn that he had one of these with a fellow officer. Problem is, [[YourCheatingHeart she was (and still is) married]], and one of their trysts provides him with an alibi for a drug theft he's been implicated in.
* DisappearedDad: Much like his US counterpart, he has a rocky relationship with both of his daughters thanks to his alcoholism and his two failed marriages (which are themselves due to his drinking problem).
* {{Expy}}: Lennie Briscoe, although less snarky.
* HeroicBSOD: Suffers this after [[spoiler: Matt is killed]]. It really doesn't help that the whole thing happened right in front of him and that he's already been through this. Has another one after [[spoiler: Wes is killed too]].
* KindheartedCatLover: Is seen caring for and commiserating with Matt's cat during "Survivor's Guilt", and walking off with it at the end (in a deleted scene).
* KnightInSourArmor
* ILetGwenStacyDie: It's implied that he feels somewhat responsible for his previous partner's death, telling Matt, "There was nothing I could do". Later, after [[spoiler: Matt himself is killed]], he expresses a similar sentiment while confiding in his AA group--"I couldn't get to him in time"--and giving his statement to the other detectives--"I should have been with him".
* LikeASonToMe: Thinks this way about Matt, obvious even ''before'' [[spoiler: the latter is killed]] and stated outright when he talks with the mother [[spoiler: of his killer--"The police officer who died? His name was Matthew Devlin and he was like... MY son."]] Not surprising, considering how he screwed up with his actual children, thanks to his drinking problem.
* OffTheWagon: [[spoiler:Comes ''very'' close to being played straight--note the scene in Matt's now deserted apartment where he stares at the beer bottles for what seems like an eternity as well as the ending where there's a glass of whiskey in front of him--but is ultimately averted in "Survivor's Guilt" with the help of his new partner, Sam. Comes even closer in "Hard Stop", where he actually goes so far as to buy a bottle of vodka before coming to his senses and walking out of the store without it.]]
* PapaWolf: To Matt, mostly, obviously, but a few moments with Alesha also. Basically to anyone younger than him who he can sense needs a surrogate father figure.
* StraightMan
* WhatTheHellHero: Gets a few of these:
** In "Anonymous" his underhanded attempts made to correct mistakes made in the initial investigation end up making Matt look dishonest and incompetent and thoroughly humiliated in court. Matt pointedly refuses to sit with him in court and later blasts him for putting him in such a bad position.
** Similarly, in "Haunted", when asked how he and his then-partner missed crucial clues, he admits to his alcoholism--and his partner's amphetamine addiction. The man reads him the riot act, mentioning the numerous things he did to help him during his drinking days--to the detriment of his own personal life--and rebuffs Ronnie' s feeble excuses--"I was under oath"--and attempts to make amends--"I only eat with family and friends. And I lost my family covering your ass."
** Jimmy Valentine ''tries'' to pull this in "Honor Bound"--much like in the above example, cites the many times he covered for a drunk or hungover Ronnie. But the fact that he expected Ronnie to repay him by turning a blind eye to him being a murderous DirtyCop completely eclipses his argument.

!!DS Matt Devlin (Creator/JamieBamber)

* AbusiveParents: Strongly implied--his contempt for a child abuser--"I know people like you", his [[BerserkButton feelings]] about victimized children in general, his empathy with an abused kid--"I've been that kid, Ronnie", and with a young woman who refers to her father as a "bastard"--"Are we related then, do you think?", but neither the extent nor specific perpetrator is ever made clear.
* BadassAdorable[=/=]HiddenBadass: He's gorgeous, amazingly polite... and in at least every other episode he runs down, disarms and disables a suspect, all while never cracking that well-mannered veneer.
* BerserkButton: Several--child abuse, established in the episode "Unloved", Alesha Phillips, established in [[http://www.tv.com/law-and-order-uk/alesha/episode/1261417/recap.html?tag=episode_header;recap Alesha]], and Ronnie Brooks, established in [[http://www.tv.com/law-and-order-uk/honour-bound/episode/1294062/recap.html?tag=episode_header;recap Honor Bound]].
--> (As he and Ronnie arrest Dr. Merrick, Alesha's rapist)
--> '''Merrick''' (yelps in pain as Matt cuffs him): "You're hurting me!"
--> '''Matt''' (CheshireCatGrin): "Yeah, I know. Didn't that feel good?"
* BewareTheNiceOnes[=/=]YouWouldntLikeMeWhenImAngry: He's a pretty nice guy... until/unless you tick him off, usually by pushing one of the abovementioned buttons.
--> (As they interrogate a suspect)
--> '''Matt''': Come on, man. Don't make me play "bad cop".
--> '''Ronnie''': You wouldn't like him when he plays "bad cop".
* ByTheBookCop: To the point where he once arrested a friend for using cocaine--[[WhatAnIdiot right in front of him]].
* {{Expy}}: Mike Logan, at least at first.
* FairCop[=/=]MrFanservice[=/=]PrettyBoy: And ''how'', to the point where numerous people have reacted to his good looks, ranging from come-ons and compliments to sarcastic put-downs--even the man suspected of [[spoiler: being behind his murder (he isn't)]] refers to him as "Pretty Boy Cop".
* [[spoiler: ForgottenFallenFriend]]: Despite his importance as a character and his relationship with Ronnie, Matt is never explicitly mentioned again after the episode dealing with [[spoiler: his murder]]. Even when another of Ronnie's friends, [[spoiler: DI Wes Layton, is shot and killed]], there is still no mention of him and how similar the two events were for Ronnie. The closest reference we get is that Ronnie's grandson, born on the day [[spoiler: Matt died]], is named Matthew. Despite this clearly being done in his honor, it still fails to spark any discussion of him. Coincidentally, this isn't the [[Series/HoratioHornblower first time]] this happened to one of Creator/JamieBamber's characters...
* GoodIsNotDumb: He's a charmer, looks like an angel, and has a ready smile for everyone, which has led to many, many suspects underestimating him because he tends to ConfoundThemWithKindness.
* InnocentBlueEyes: Of the "heroic" variety. To the point where they're the last we see of him.
* KindheartedCatLover: Alesha is delighted to learn he has a cat in the episode "Deal", [[spoiler: and Ronnie is seen caring for it (and commiserating with it) in "Survivor's Guilt"]].
* ILetGwenStacyDie: It's implied that he feels somewhat responsible for his friend's suicide because he didn't protect him from the priest who was molesting him, nor realize that he was contemplating killing himself.
* MistakenForRacist: The attorney for [[spoiler: his killer]] implies that he was this simply because he was a cop. Alesha tearfully and angrily denies this.
* NiceJobBreakingItHero: In "Honor Bound", becomes suspicious of the murky events in the episode's prologue and continues to investigate despite several people warning him not to. It exposes the actions of a DirtyCop... who tries to implicate Ronnie as payback, resulting in the latter's humiliation when his alcoholic past is brought up, as well as his ex-lover's own humiliation when their adulterous affair is revealed as well. By episode's end, Ronnie is devastated at the loss of two people he clearly cared very much about and Matt is forced to apologize for his part in the whole thing.
* OfficerOHara: He reveals his heritage while trying to gain the trust of a young prostitute he's interrogating--very noticeably thickening his accent and pinpointing almost exactly where she grew up. In another episode he states that he was given a lot of grief about it during his rookie years--"they called me "Mick" for the first six months because my family are Irish."
* PapaWolf: Inverted with Ronnie, as despite being the younger of the two, it's he who freaks out if/when Ronnie appears to be in any kind of danger.
* RaisedCatholic: Mentions having lit a candle for a murder victim, "Once a Catholic...", but he's also clearly disillusioned with his faith--in the episode "Confession", he states that he hasn't been in a confessional in over 20 years, and the events of that episode offer a pretty strong indication of why this has happened.
* RapeAsBackstory: By proxy. In "Confession", we learn that two of his childhood friends were molested by their neighborhood priest, but it is left ambiguous as to whether Matt was a victim as well. He denies it throughout the episode, but at the end, admits that he's repressed things so much that he's genuinely uncertain as to what, if anything, happened to him.

!!DS Sam Casey (Paul Nicholls)
* ChuckCunninghamSyndrome: No explanation for his absence in Season 8.
* DisappearedDad: [[spoiler:And is ''not'' looking for Ronnie to [[WellDoneSonGuy replace him]]. He is also apparently and unwillingly this to his own son, only getting to see him once a month.]]
* {{Expy}}: Mike Logan and Ed Green, as far as his temper and poor impulse control go. His behavior in the first two Season 7 episodes displayed some of Ronnie's lesser traits as well--a drinking problem, fragile relationship with his child.
* FairCop
* GoodCopBadCop. Guess which one he is.
* HeroicBSOD: Suffers this throughout "Tracks" (starting when he's unable to save a young victim of the train crash) and "Tremors".
* HotBlooded: Sam's got a short fuse.
* IdiotBall: Oh, Sam. You had to know that [[spoiler: joking to a black suspect about what you have to do to get two weeks in Barbados [[MistakenForRacist would come back to bite you, right?]]]] No? Well how about [[spoiler: sleeping with a perp posing as a "victim?']]
* KickTheDog: Subverted; he leads him outside by the leash.
* PermaStubble
* SuspiciouslySimilarSubstitute: Subverted. Despite some obvious similarities with his predecessor--young, good-looking, absent (and possibly abusive) father, there were some equally obvious differences--Matt's temper was generally limited to [[BerserkButton certain issues]], whereas Sam appeared to have a short fuse about ''everything''. Matt also clearly cherished the surrogate father he had in Ronnie. Sam seemed to resent Ronnie's attempts at being this--despite generally getting along, the two simply did not have the rapport that Matt and Ronnie did.
* WeHardlyKnewYe: Lasted only two series and disappeared without any explanation, just as he was getting interesting.

!!DS Joe Hawkins (Ben Bailey Smith)
* BerserkButton: Taunting him about his light skin and presumably biracial heritage.
* ButNotTooBlack: He's mocked about his light skin by a dark-skinned suspect, who alternates between seeming jealous--insinuating that he's had an easier time because of it--or being contemptuous--calling him a "mongrel". He didn't take too kindly to it.
* {{Expy}}: Ed Green.
* FairCop
* HalfBreedDiscrimination: As cited above, his reaction when a suspect calls him a "mongrel" indicates that this isn't the first time he's dealt with comments like this.
* NaiveNewcomer: Subverted. He's new to the Homicide Division, but he's been a detective for some time.

!!DI Natalie Chandler (Harriet Walter)
* DaChief
* {{Expy}}: Anita Van Buren.
* IronLady: Despite her obvious grief and anger, she waits until she's alone in her office with the blinds drawn to cry over [[spoiler: Matt's death]], and she refuses to break down despite the overwhelming evidence that her father is a killer.
* MamaBear: Is fiercely defensive of her subordinates, to the point where criticizing or harming them (Alesha's assault, [[spoiler: Matt's death]]) is essentially a BerserkButton for her, even as them screwing up provokes a reaction much like that of a disappointed/angry parent.
* PutOnABus: Her absence in Season 7 is explained as her taking a leave of absence to care for her ill mother. [[TheBusCameBack She resurfaces in the 4th episode of Series 8, but technically not as a cop, but rather as the daughter of their prime suspect.]]

!!DI Wes Leyton (Creator/PatersonJoseph)
* BlackBestFriend: To Ronnie
* HappilyMarried: We only see his wife once, but this trope clearly applies.
* WeHardlyKnewYe: Appeared for only a series and a half.


!!James Steel (Ben Daniels)

* AwesomeMcCoolname / NamesToRunAwayFromReallyFast
* ChekhovsSkill: His previous experience as a defense attorney saves his bacon when he's charged with "perverting the course of justice".
* {{Determinator}}: His reluctance to give a case up or use any means necessary to win is legendary, and actually comes back to bite him in the ass in his last episode: he gets arrested for perverting the course of justice after some evidence that would have exonerated a murder suspect six years previously was found to have gone missing. The same episode says that his conviction rate is '''ninety three percent'''.
* {{Expy}}: Benjamin Stone, with Jack [=McCoy=]'s penchant for bedding his female colleagues.
* HeelRealization: Claims he gave up being a defense attorney because he couldn't sleep at night. Oddly enough, he fails to display this trope during some of the many stunts he pulls as a prosecutor.
* HelloAttorney
* OfficeRomance: As stated above, his relationships with his female colleagues. And his final scene with Alesha (as well as his reaction to her rape) reveals that he has feelings for her as well, even though it never gets beyond attraction.
* PutOnABus: Although acquitted of charges of perverting the course of justice, he still feels ultimately responsible for the MiscarriageOfJustice that occurred--an innocent man went to prison, while a guilty man went free and killed several more victims--and decides to resign from the CPS.
* TranquilFury: His matter-of-fact demeanor when he declares that he'd like to see Alesha's rapist "locked in a room with his victims" does little to hide the fact that he'd like to be included.
* WhatTheHellHero His "win at all costs" method of handling a case has led him to do some borderline reprehensible things, all of which tend to have the same theme:
** In "Paradise" he takes advantage of his friendship with another lawyer, jeopardizing the man's career, in order to garner necessary information. Upon finding out what he's done, the other lawyer gives him a blistering TheReasonYouSuckSpeech and rebuffs James' attempts to make amends (one of the few times he was genuinely sorry for the problems that he'd caused), saying, "I don't want to be your collateral damage anymore."
** In "Anonymous", humiliates Matt Devlin in court over an error made during the investigation, accusing him of being both dishonest and incompetent (despite knowing full well that he's neither), discrediting not only his testimony, but possibly his tenure as a detective. When Alesha blasts him for this, he dismisses it as "collateral damage."
** "Skeletons". Similarly embarrasses an ex-lover over their past relationship and declares that her sole reason for testifying against him is to get back at him for dumping her. Alesha blasts him for this as well, asking if the woman's reputation was, of course, "collateral damage."

!!Jacob Thorne (Dominic Rowan)

* TheCasanova: Much like James Steel, he seems to have bedded or flirted with nearly half the female lawyers in London.
* {{Expy}}: Jack [=McCoy=], even moreso than his predecessor
* HelloAttorney

!!Alesha Philips (Creator/FreemaAgyeman)

* BerserkButton: Rape, thanks to her experience, as well as women [[FalseRapeAccusation who lie about it]].
** She doesn't like sexist putdowns either, or people trying to play the race card to garner her sympathy for a cop killer--especially since said cop was her friend and [[HeroicSacrifice died saving her life]].
* BrokenBird: And ''how''. Raped by her doctor, loses her friend/mentor before they get a chance to explore their feelings for each other, and another friend is killed saving her life before ''they'' can explore their feelings for each other. Unlike most examples of this trope, she appears to have come out of each tragedy stronger than before.
* CharacterDevelopment: She starts out as a NaiveNewcomer, but grows more and more confident and competent as time goes on--by Series 2 she handles the questioning of several witnesses, by Series 5, prosecutes several cases on her own, and the final mention of her at the beginning of Series 7 is that she's been transferred to a senior position in another division.
* EveryonesBabySister: As seen in the episode "Alesha", she also serves as a {{Berserk Button}} for everyone in the group--infuriated by what's happened to her, they go all out to bring her rapist to justice. And note that James can barely stand to watch the video of her rape, while Matt can't bring himself to watch it at all.
--> {{Iron Lady}} DI Chandler: "I'd like to cut off his dick with a rusty hacksaw and ram it down his throat!"
* {{Expy}}: No one in particular, just the "young, pretty, female assistant DA" that's been a standard of the original ever since Paul Robinette departed, though her youth and initial inexperience seem very reminiscent of Claire Kincaid, and she even shows a few flashes of Robinette himself (the abovementioned scene where she bristles at a defense lawyer's race-baiting, plus their race of course).
* HelloAttorney
* IdiotBall: In "Alesha", where she tries to entrap a doctor who touched her inappropriately and gets raped.
** HeroicSacrifice: An AlternateCharacterInterpretation of the above. She essentially jumped on a grenade, knowing something bad would happen, in order to get justice for all of Merrick's other victims, and knowing he would never pay for her. Indeed, when Matt asks why she went back after he'd already assaulted her, she admits that she wasn't expecting him to rape her, but states, "Someone had to stop him. At least now we can lock the bastard up."
* PutOnABus: In the season 7 premiere, it's mentioned that she was transferred to a senior crown prosecutor position in another office. This narrowly averts a literal BusCrash, as she would have been a passenger on the ill-fated train otherwise.
* TwoferTokenMinority: Is black and female. But even though she's the only non-white member of the main cast, it's hard to really call her a "token", given that London's incredible diversity is well represented among the supporting players.
* UnresolvedSexualTension: With James and with Matt.

!! Kate Barker (Georgia Taylor)
* HelloAttorney
* IdiotBall: Chats with an opposing attorney about the tactics Jake is likely to use, then acts shocked when (a) the woman undermines their strategy by preparing her witness, and (b) Jake and Henry read her the riot act for what she's done.
* SuspiciouslySimilarSubstitute: Their personalities are radically different, but she still falls into the "pretty young woman" slot that Alesha filled.

!!George Castle (Bill Paterson)

* AndStarring
* BadassGrandpa
* ChekhovsSkill: Like James, was a defense attorney for a while. Despite nearly two decades having passed since then, he does an excellent, if ultimately unsuccessful job of representing an old friend on a manslaughter charge.
* DaChief
* DecemberDecemberRomance: In the episode "Denial", it's strongly implied that he and the current victim had a relationship back in their younger days, and their present-day conversation indicates that the feelings are still there.
* {{Expy}}: Adam Schiff
* PapaWolf: Much like DI Chandler, is fiercely protective of his underlings, yet doesn't tolerate mistakes from them.

!!Henry Sharpe (Creator/PeterDavison)
* AndStarring: Occupies this spot now that Bill Patterson has left.
* BadassGrandpa
* DaChief
* SuspiciouslySimilarSubstitute