Even though CIA and IMF are on the same side, more often than not they strongly disapprove of the IMF's methods, particularly those involving Ethan Hunt, and thus when they are involved in a mission, they are more likely to be part of a problem rather than a solution.
A CIA analyst in charge of the Langley HQ's cybernetic security.
- Butt-Monkey: He is just a guy doing his job who didn't actually deserve that situation. The poor man is given a laxant in his hot chocolate to give Ethan time to retrieve the NOC List and sees that the List has been downloaded in his absence. Then Kittridge in a fit of anger wants him to be sent somewhere in Alaska for his failure and his clothes been sent by mail there.
For more information, see the page IMF Leadership
The coldhearted and pragmatic Director of the CIA and August Walker's boss, who is willing to be cruel as necessary to maintain world peace.
- Black Boss Lady: As the head of the CIA.
- Jerkass Has a Point: As manipulative and condescending as she maybe, Sloane is right to distrust Ethan since he failed to secure the plutonium cores in Berlin.
- Manipulative Bitch: When working with Hunley to figure out who John Lark is, she makes sure that she has the upper hand, even having an armed CIA team ready to detain both Walker and the IMF to bring them back to Langley. Too bad, she didn't count on Walker having his own people inside with said team.
- A Million Is a Statistic: To her, innocent civilians silenced to prevent witnesses of dirty CIA wetwork are not even sacrifices, but the eggs you must break to make an omelette of world peace and stability.
- Moral Sociopathy: Ultimately, she comes to agree with Ethan Hunt's compassionate worth ethic, not out of any respect or agreement with his morality, but only because "The IMF cares about the one life as much as the one million, so I won't have to."
- Reasonable Authority Figure: Is perfectly willing to see both sides of a situation, and not just blindly trust the information given to her by her Walker, actually working with Hunley and Ethan. Of course, this does mean shutting the whole operation down and shipping everyone to Langley for them to figure things out, which doesn't work for Ethan, nor Walker.
- At the end of Fallout, she comes to understand why Ethan and the IMF are needed.
- Well-Intentioned Extremist: Her suspicion over Hunt and Walker are justified when you consider her position.
CIA assassin who is assigned to work with Ethan Hunt, something neither man is comfortable with as Walker is far more ruthless and brutal in his methods in their mutual pursuit of the terrorist known as John Lark. It later turns out that he is John Lark.
- Affably Evil: Not only is he charming and debonair, but he also considers being a CIA assassin just his job, and nothing he has to do as personal. Even when he's revealed as John Lark, he's still well-intentioned and seems utterly exasperated with Lane's vengeance obsession.
- Alas, Poor Villain: Walker's death is so horrifying (getting half his face burnt by boiling helicopter fuel, falling down from a mountain and being impaled by a helicopter crane) that it is impossible not to feel some sadness.
- Anti-Villain: Walker wants to kill a third of the world's population so that the world powers will finally work together to fix something, which might create peace later on.
- Arc Words: "There cannot be peace without first, a great suffering. The greater the suffering, the greater the peace."
- Ax-Crazy: After his helicopter crashes, he becomes nuts.
- Badass in a Nice Suit: Walker is a good fighter and is only seen wearing either a coat or a blazer, or sometimes even both.
- Badass Mustache: Has a mustache and Perma-Stubble to illustrate his grizzled nature.
- Big Bad Duumvirate: With Lane after being outed as Lark. While they do have different motives, they are still working together nonetheless.
- Boxing Battler: While he uses a variety of fighting techniques, his most famous move is a boxing-style barrage of jabs and hooks delivered in the bathroom fight.
- Blood Knight: Looks forward to every battle.
- The Brute: A very physical man.
- Cowboy Cop: At first appears to be the CIA version of this as Ethan accuses him of having killed many members of the Apostles instead of briging them in for questioning. Truth is he was getting rid of witnesses.
- Crazy-Prepared: More of a man of action but he had some of his men infiltrating the CIA's assault squad in case his cover is blown and keeps a picture of Julia just in case he needs leverage on Hunt.
- Cruel and Unusual Death: Gets half of his face scarred by helicopter fuel and is later impaled through the skull by a hook which pulls him down a cliff face and into the exploding wreckage of a helicopter, leaving very noticeable bloody residue along said cliff face. It's not pretty, to say the least.
- Death by Disfigurement: Shortly after half his face is chemically burnt, he dies falling off a cliff.
- Disney Villain Death: An especially brutal example. He's pulled off a cliff by the falling wreckage of a helicopter... because its cargo hook which has been lodged in the cliff up to that point keeping it from falling is dislodged by Ethan and impales him through the head.
- The Dreaded: Enough for Luther to warn Ethan about him.
- Elites Are More Glamorous: With the CIA's Special Activities Division when he was pulled out from anti-Syndicate ops to be with the IMF team in Europe.
- Even Evil Has Standards: He's put off by Solomon Lane's obsession with hurting Ethan personally.
- Evil Is Bigger: Played by the 6'1 and brawny Henry Cavill, towers over Ethan, played by the infamously short Tom Cruise.
- Expy: As John Lark, his motives are similar to that of Kurt Hendricks, as both villains wanted to use nuclear weapons to destroy the world in the name of peace.
- Facial Horror: Gets the right side of his face scarred after getting splashed with aviation fuel from his crashed helicopter.
- Foil: Specifically referred to as the "hammer" to Ethan's "scalpel." This means that Ethan is more accurate, precise and gets the job done without any innocent lives lost. The "hammer" is a destructive force, more brutal and less precise, which fits.
- More so when it's revealed that he's a mole working with Lane. For as much as Ethan tends to go rogue, he's still on the side of the "good guys" in the end, Walker on the other hand isn't.
- Freudian Excuse: Walker is fed up with the world after having been abused and abused, mistreated and mistreated day after day by his own government, that it is eventually understandable why he went insane in the end. It is obvious that the above quote isn't referring to Hunt, but actually himself. His terrorist attacks are all because he wants to cause peace, as well.
- Genius Bruiser: A big, brutally strong fighter and a very cunning and skilled CIA agent, not to mention political visionary.
- Hero Antagonist: Subverted. Walker is in the way of IMF's mission out of fear that Ethan Hunt and his allies could go rogue. Of course this gets averted when it turns out Walker is actually working with Lane.
- Hero Killer: Kills Hunley in the process of escaping with Lane.
- Informed Ability: Played up as a huge physical threat and Ethan's equal, and explicitly referred to as the CIA's best killer. However, he fails to live up to this in the film proper as his first act is nearly getting himself killed in a HALO jump, then gets his ass handed to him with Hunt in the fight against "Lark" in the bathroom, and even Non-Action Guy Hunley gets some decent licks in until Walker pulls a knife. He does put up a solid showing against Ethan in the final fight, but both men have taken so much damage beforehand from the helicopter crashes that even that rings a bit hollow. He's pretty impressive against a couple of mooks but he doesn't quite live up to his hype.
- It's Personal: Well, he claims to have nothing against Ethan and doesn't seem to care all that much about Lane's quest for revenge against him, but he eventually makes it personal anyway by threatening Julia.
- Knight of Cerebus: Once he's revealed to be John Lark.
- Made of Iron: He's a beast physically and treats Hunley raining blow after blow on him as a mild irritation as he goes for his knife.
- Manifesto-Making Malcontent: As John Lark, he writes a manifesto that Debruuk forces Hunt and company to read on live television before he'll assist them in unlocking his phone. Too bad it's all staged.
- The Mole: Is actually John Lark, and is working on the mission with Ethan to try to frame him.
- Mole in Charge: Is the CIAs leading agent in the hunt for John Lark and the Apostles, despite secret being Lark himself.
- Never Hurt an Innocent: Infamously known for not doing this as his job is to assassinate and clean up. When the group is spotted by a police officer he is ready to gun her if Ethan can't convince her to walk away.
- Oh, Crap!: This is Walker's final expression just before getting a steel hook straight in his eye socket.
- The Paragon Always Rebels: He's described as one of the CIA's best assassins and much like Lane himself, he ultimately turns against the system he's spent his career protecting due to increasing disillusionment. Apparently, several other CIA operatives agree with him enough to turn on their own squadmates when Sloane sends a team to capture him.
- Punch-Clock Villain: Walker is not a sadist or anything similar to it and he has nothing personal against the protagonists, no matter how hard it is to kill them if he needs to. Even when he's revealed as the true John Lark, he still doesn't have anything personal against Hunt or anyone else and doesn't give a shit about Lane's personal vendetta against Hunt.
- Reckless Sidekick: Some of his actions are needlessly dangerous to the point of endangering the mission, the most obvious one being jumping off a plane into a thunderstorm despite Hunt warning against it, something that very nearly gets both men killed when Walker is struck by lightning and knocked unconscious. Ironically enough though, as John Lark he views Solomon Lane as his reckless sidekick because Lane insisting on getting revenge on Hunt meant constant delays and sidetracks in their mission.
- Red Oni, Blue Oni: He thinks he is the cold, pragmatic Blue to Hunt and Lanes' more passionate, emotional Reds, but it is actually the reverse since underneath his cool exterior he is a violent, hot-headed and reckless killer and terrorist, while the other two are - despite their emotional ties- much more cool-headed and efficient overall.
- Rogue Agent: He is utterly ruthless in his pursuit of John Lark and the Apostles to the point of killing every Apostle he ever came across, and Hunt is reluctant to work with him because of his extremist methods. In reality, fed up with the world, he goes rogue and is Lark himself, and presumably was only killing those Apostles in order to maintain his cover by not having any witnesses.
- Sanity Slippage: After his helicopter crashes, he goes crazy.
- Sir Swears-a-Lot: Easily the most foul-mouthed character in the series thus far, even getting to use the series' first Precision F-Strike eventually.
- Sixth Ranger: Walker is initially set up as the odd one out member of Ethan's team, the quiet but brutish CIA agent assigned to shadow Hunt at Sloane's behest. Subverted when he's revealed to be the true identity of Lark. Ilsa ends up becoming the team's Sixth Ranger instead, just like the last film.
- The Sociopath: He is very good at keeping a facade, as he is in fact the extremist nicknamed "John Lark", although hes not as bad as Lane, who wants to murder millions over a grudge, something which even Walker is disgusted by.
- Tall, Dark, and Handsome: As befits a character played by Henry Cavill.
- Ungrateful Bastard: Ethan saves him from death when he is struck by lightning HALO jumping over Paris, but when they land Walker doesn't even mention it despite both men nearly dying as a result- the fact that it was his own damn fault might have something to do with it.
- Villain: Exit, Stage Left: His goal in the climax after he and Lane set off the nuclear weapons is to escape on a helicopter to a minimum safe distance while Lane stays behind, intending to perish in the explosion. Ethan must try to stop him by commandeering the second helicopter to go after him.
- Walking Spoiler: You can't talk about this guy without talking about his true identity.
- Well-Intentioned Extremist: Walker's suspicion over Hunt is understandable when you think about it. Also in his work with Lane. All he wants is to create a large enough international incident to get the world's powers working together. Arguably moreso than Lane, as Lane seems to do this out of spite against Hunt.
- Why Won't You Die?: Screams this at the end of his and Hunt's final fight.
- Would Hurt a Child: As Ethan points out, John Lark unleashes a smallpox plague that results in the deaths of millions, including women and children, so he is an absolutely ruthless terrorist.