->'''Played By:''' CillianMurphy

* ActionSurvivor
* AdrenalineMakeover
* BewareTheNiceOnes
* ButtMonkey: Even in [[CrapsackWorld this world]], Jim has a tough time of it.
* DeadpanSnarker
* TheEveryman
* EyeScream: How he kills [[spoiler:Cpl. Mitchell.]]
* NakedOnArrival: How he wakes up from his coma.
* NotSoDifferent: He shows himself to be capable of the same brutality as the Infected.
* OnlyOneName: His surname is never revealed.
* TookALevelInBadass: Over the course of the film, he goes from a confused courier to an Infected-killing badass who runs circles around a group of soldiers.

->'''Played By:''' Naomie Harris

* ActionSurvivor
* {{Badass}}
** BadassLongcoat
* BrokenBird
* BrutalHonesty: She tells Jim in no uncertain terms that she will not hesitate to kill him or leave him behind if need be.
* DefrostingIceQueen
* GenreSavvy
* {{Jerkass}}
** JerkassHasAPoint
** JerkWithAHeartOfGold
* TheMedic: Her job before the outbreak, which comes in handy in the new, post-outbreak world.
* TokenMinority

->'''Played By:''' Megan Burns

* ActionSurvivor
* AdrenalineMakeover
* {{Badass}}
** LittleMissBadass
** TookALevelInBadass
* BrattyTeenageDaughter: Averted, thankfully.
* CreepyMonotone: While out of her mind on valium.
* TheDogBitesBack
* [[FakeBrit Fake London Native]]
* MissingMom
* WrenchWench
* WiseBeyondTheirYears

->'''Played By:''' Brendan Gleeson

* ActionSurvivor
* {{Badass}}
* TheDeterminator
* DriverOfABlackCab: Averted and parodied in a deleted scene.
* [[FakeBrit Fake Englishman]]
* TheHeart
* PapaWolf
* NiceGuy
* SensitiveGuyAndManlyMan: He's both. He's a total {{badass}} who can take charge, but he's a loving father, knows his wine, and appreciates the beauty that's still in the world.
* StepfordSmiler: A fairly unique example. For the sake of his beloved daughter, he puts on a happy, cheerful face while keeping his own optimism alive. When speaking privately to Jim, he expresses more uncertainty. He also has a short-lived blow-up when [[spoiler:the soldiers donít appear to be there.]] However, he quickly gets over this [[spoiler:due to his sudden unfair infection]] and apologises to Hannah for shouting around her.
* TeamDad

->'''Played By:''' Noah Huntley

* ActionSurvivor
* DeadpanSnarker
* {{Jerkass}}
** JerkWithAHeartOfGold: Heís snarky and callous, but he has a wonderfully touching monologue about his family during the infection.
* [[spoiler:WeHardlyKnewYe]]



!!Major Henry West
->'''Played By:''' Creator/ChristopherEccleston

* [[spoiler:AffablyEvil]]
* AFatherToHisMen
* AnOfficerAndAGentleman
* {{Badass}}
* [[spoiler:BigBad]]
* [[spoiler:KarmicDeath: At the film's end.]]
* PapaWolf
* StepfordSmiler

!!Sergeant Farrell
->'''Played By:''' Stuart McQuarrie

* [[spoiler:DefectorFromDecadence]]
* [[spoiler:DefiantToTheEnd]]
* OnlySaneMan
* TokenGoodTeammate

!!Corporal Mitchell
->'''Played By:''' Ricci Harnett

* TheBully
* DeadpanSnarker
* [[spoiler:EyeScream: How Jim kills him.]]
* {{Jerkass}}
* [[spoiler:KarmicDeath]]
* SociopathicSoldier

!!Private Jones
->'''Played By:''' Leo Bill

* ButtMonkey
* LethalChef
* ManChild
* NervousWreck
* RealMenWearPink: Wears a pink apron while cooking... and fighting infected.
* ShrinkingViolet
* TearsOfFear