* BunnyEarsLawyer: Despite his OCD obsession with cleanliness, he's good at what he does.
* DeadpanSnarker: He certainly has his moments.
* FireForgedFriends: With Miles and, to a lesser extent, the team.
* IJustWantToBeSpecial: He just wants to solve interesting cases.
* SharpDressedMan: He wears suits from Savile Row.
* SuperOCD: Under normal situations, it's fairly mild. When he gets stressed, it goes UpToEleven until he has to self-medicate with alchohol to remain functional.
* FireForgedFriends: With Chandler
* TheMatchmaker: On at least two separate occasions he tries to hook Joe up with a colleague.
* PapaWolf / BigBrotherInstinct: Shows signs of both towards Chandler.
* ParentalAbandonment / ParentalIssues: His father, who was in the pocket of the Kray brothers but was treated like a joke by them, left him and his mom. [[spoiler: Actually, he was killed because he refused to let them touch Ray.]]
--> "I will be like Atlas, carrying the weight of the investigation..."
* AmateurSleuth: And the real detectives don't let him forget the "amateur" part.
* ManChild: Not an extreme case, but it fits.
* MyGodWhatHaveIDone: Reacts like this in series 1 when he realises [[spoiler: he's accidentally given advice to the JackTheRipoff killer]] and again in series 3 when he feels like he could have done more to help the team.
* MagnificentBastard: [[spoiler: He and DoubleAgent Jack use Chandler and his team to depose the fake Krays, creating a power vacuum that he can then fill.]]
* BigBrotherMentor: Every member of the team tries to take this role for him to varying degrees. Hilariously, the one he seems to latch onto is Chandler, resulting in a very organized desk.
* BreakTheCutie: Subverted. He's adorable and sensitive, and in the second season, he is harassed by most of the corrupt cops in the station, gets attacked and cut up with a knife, is harassed and threatened some more, [[spoiler: is suspected of being TheMole by people he admires and trusts and is thrown off the team]], and breaks down crying in the parking lot. This fails to break him, and when the team cracks the case, he's front of the line to cuff the culprits.
* CantHoldHisLiquor: Is nearly always the first to get giggly/pass out during team outings.
* [[spoiler: HalfIdenticalTwin]]
* GreenEyedMonster: To all of Chandler's love interests in S3, and the platonic version towards [[spoiler:Mansell in S4 over Mansell's relationship with his sister]]
* IgnoredEnamoredUnderling: Kent could be the page image
* OddFriendship: With Mansel in series 4, despite their differences.
* [[spoiler: RedHerringMole]]
* PuppydogEyes: Of the brown eyed variety
* SharpDressedMan: Although not as expensively dressed as Chandler, his off the rack suits certainly look the part.
* TenderTears: He deals with particularly bad cases by having a cry in the parking lot where he thinks nobody can see him. MenDontCry is averted because though the whole team knows, nobody thinks less of him for it.
* DrivenToSuicide: [[spoiler: [=McCormack=] hangs himself rather than having the police arrest him for betraying his fellow officers.]]
* [[spoiler: AnOfferYouCantRefuse: The Krays threaten his family to force him to betray the team.]]
* TheLancer: Originally to Miles.
* [[spoiler: TheMole: Rats the team out to the press in Series 1. Due to this, he was demoted as revealed in Series 2.]]
* RememberTheNewGuy: An old friend of the team and especially [=McCormack=], only neither we nor Chandler recognize him.
* OddFriendship: With DC Riley. Seemed to have failed when she finds out he's cheating. But series 4 shows them still going strong. [[spoiler: Until Mansell fakes a romantic letter to Buchnan from Riley]]
** With Kent in series 4, despite their differences.
* YourCheatingHeart: After only six months of marriage he starts cheating on his wife. According to him: "I get bored."
* TheHeart: She's the one usually seen offering comfort to the victims.
* OddFriendship: Has one with Mansell of all people. At least until she discovers he's cheating on his wife. But series 4 shows them still going strong. [[spoiler: Until Mansell fakes a romantic letter to Buchnan from Riley]]
* OneOfTheBoys: Explictly stated to be this in series 3 and by her actress.