Kenny Ackerman

Captain Kenny Ackerman (ケニー・アッカーマン隊長) is a member of the Military Police Brigade's central branch and also the anti-personnel control squad. He is responsible for the death of Historia's mother.

Appearance
Captain Ackerman is a very tall and slim man who appears to be well-built. He has short, coarse looking dark hair that reaches to his neck and also has a thin beard along his jawline. He has the appearance of a middle-aged man with wrinkles around his eyes, which are small and piercing. He is always seen wearing a simple white shirt with a black tie that is never fully done up, and a large black overcoat that reaches past his knees. He also has a bowler hat with a white band around it.

Personality
Captain Ackerman is an incredibly serious individual. He will do anything to get the job done including betraying Dimo Reeves, who had just turned over Eren Yeager and Historia Reiss. While he operates with utter professionalism, showing neither remorse nor pleasure in his mission, the revelation that he was once an infamous serial killer suggests there is much more to him. His reasons for killing in the past, as well as becoming a government agent, remain unknown. Levi mentions learning quite a bit from him concerning how to out-maneuver his targets, suggesting that Ackerman is highly intelligent and a strategic thinker.

History
In the decades prior to the events of the story, Ackerman was an infamous serial killer that stalked victims in the Capitol. His preferred method of killing was to slit the throats of his victims which earned him his infamous handle "Kenny the Ripper" (切り裂きケニー), and it was rumored that he murdered over 100 members of the Military Police Brigade. However decades later his killings ceased and the terror that he once inspired dwindled into an Urban Legend. He also trained a young Levi who now shares his same surname hinting at a familiar bond between them, though when they parted ways he became a member of the 1st Brigade via reasons and circumstances that remains unknown as even Levi was unaware of it until he saw his old teacher after decades apart.

Year 845
Captain Ackerman first appeared as a member of the group that arrived at the place Historia grew up. He grabbed Historia's mother and asked Lod Reiss if she and Historia were related to him. Lod Reiss denied it and Captain Ackerman slit Historia's mother's throat while she wished that Historia had never been born. As another member approached Historia to do the same, Lod Reiss told them to stop and saved her life by telling her that her new name would be Krista Lenz, and she was never allowed to talk about what happened here.

The Uprising arc
Captain Ackerman next appears as the leader of the group sent to retrieve Eren and Historia from Dimo Reeves. Upon arriving he reminds Historia who he is and remarks how much she has grown. He brings Reeves outside under the pretence of giving him a payment. After luring him into the woods he asks Reeves if he knows who Levi Ackerman is, to which Reeves responds that everyone knows Levi but he had never heard his full name. Captain Ackerman tells Reeves that he personally trained Levi and then kills him in the same way he killed Historia's mother, claiming that it is his own fault for Reeves' betrayal. A female assistant then tells him that Eren and Historia both had small knives on them but are still captured. He tells her to prepare the anti-personnel 3D maneuver gear, and then says that it is time for the anti-personnel control squad to show what they can do.

Members of the Survey Corps' 4th Squad, commanded by Levi, watch the movements of several men moving coffins from a funeral pallor into a carriage. Levi expresses unease about this, and speaks to Nifa about an infamous serial killer from the Capitol. She's familiar with the story, but expresses doubt that he ever really existed. However, Levi confirms that he was real and admits the man raised him, and taught him how to keep one step ahead of his targets.

His suspicions that it is a trap prove true, when Captain Ackerman appears behind them on the roof top and opens fire. Levi dodges, but Nifa is shot and killed. Two other members of the Anti-personnel Squad ambush Levi's other teammates, killing them instantly. Ackerman then greets Levi, noting that he's grown and launching himself into the air before taking aim at Levi.

Kenny takes aim at Levi but has the shot blocked by his sword. After fleeing into a nearby tavern, Kenny seemingly corners Levi and begins to lecture him about his poor strategy, why he joined the Survey Corps, and how Levi is still a 'child' compared to himself. This speech is cut short when is shot by Levi who stole the bar owner's gun. Kenny survives because of him being able to block the brunt of the shot with a chair. When awoken by his lietentant moments later he claims "My dream is slipping further away", referring to Levi escaping. The pursuit of the Survey Corps is then left up to his subordinates, as he escorts Eren and Historia to Lod Reiss.

Abilities
Decades ago, the one-day captain was an infamous serial killer who murdered within the capital and was capable of taking out over a hundred members of the Military Police, showing exceptional battle prowess. He is also very fast as he very suddenly appeared behind Historia Reiss's mother. He seems to have a lot of pull within the government as he was scene talking to a member of the Royal Family in a professional manner. That context seems to indicate he reports to a higher authority than Lod Reiss. On top of that, he is the leader of the 1st Brigade Military Police, showing high leadership skills.

When Levi felt the possibility of facing his old teacher, he was highly uneasy despite going head-on against Titans on a recurring basis. He is also very analytical and intelligent and is the one who taught Levi to think in the same strategic genius as he does, even outmaneuvering him and tricking Humanity's best soldier into walking into a trap. The fact that he was able to teach an individual as skilled as Levi these things suggests that he's an adept teacher.

3D Maneuvering Gear
Like the Survey Corps, the 1st Brigade of the Military Police have 3D maneuvering gear as well. However it is also equipped with guns so as to kill humans rather than Titans. He is able to use them to scale buildings at incredible speeds and assault his targets before they can react.

Relationships
Levi Ackerman - Captain Ackerman trained Levi and they both share the same last name. He appears to have some respect for Levi since he called him his pride. The meaning behind their similar last names is currently unknown.

Trivia

 * Captain Ackerman's back story, preferred method of killing, physical appearance, and the title of Chapter 57 being 'Kenny the Ripper' resemble real-life serial killer . One theory of the Ripper's identity and motive was that he was a government agent murdering victims as part of a larger conspiracy.

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