Kenny Ackerman

Captain Ackerman (アッカーマン隊長) (also known as mass murderer "Hash slinging slasher") 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, Dimo Reeves, and Nifa. Levi claims to have lived with him when he was younger.

Appearance
Captain Ackerman is a very tall 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, and it was rumored that he murdered over 100 members of the Military Police Brigade. He also took in and trained a young Levi, though when they parted ways and he became a member of the 1st Brigade remains unknown.

Year 845
Captain Ackerman first appeared as a member of the group that arrived at the place Historia grew up. He grabbed her mother and asked Lod Reiss if her 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 pretense 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

Several 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 mentions to Nifa 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.

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, and physical appearance 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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