Parental Abandonment / Parental Issues: His father, who was in the pocket of the Kray brothers but was treated like a joke by them, left him and his mom. Actually, he was killed because he refused to let them touch Ray.
"I will be like Atlas, carrying the weight of the investigation..."
Amateur Sleuth: And the real detectives don't let him forget the "amateur" part.
My God, What Have I Done?: Reacts like this in series 1 when he realises he's accidentally given advice to the Jack the Ripoff killer and again in series 3 when he feels like he could have done more to help the team.
Big Brother Mentor: 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.
Break the Cutie: 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, is suspected of being The Mole 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.
Sharp-Dressed Man: Although not as expensively dressed as Chandler, his off the rack suits certainly look the part.
Tender Tears: He deals with particularly bad cases by having a cry in the parking lot where he thinks nobody can see him. Men Don't Cry is averted because though the whole team knows, nobody thinks less of him for it.
Driven to Suicide: McCormack hangs himself rather than having the police arrest him for betraying his fellow officers.
Odd Friendship: 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. Until Mansell fakes a romantic letter to Buchnan from Riley
One of the Boys: Explictly stated to be this in series 3 and by her actress.