Kenny Ackerman

Kenny wanted power, and his personality was molded around this goal. He was a ruthless individual who did not hesitate to do anything to get the job done, including murdering children or betraying his allies. He operated with utter professionalism, hiding his emotions behind a fixed expression and showing neither remorse nor pleasure in his mission. He also showed a strong impulse to kill Uri Reiss when they first met. Kenny expressed a desire to live a "fun" life, but had a strange idea of what he considered "fun," commenting that he believed his grandfather's story about the Ackerman clan's history because it would be more fun to do so, and commenting that growing old and living a full life did not sound fun. The only thing stranger than his idea of fun was his sense of humor, seen when he said that his grandfather's story about the persecution of the Ackermans was "funny," and when he freed Eren Yeager in order for him to fight against Historia just for his own entertainment, even though the future of humanity was at stake. He had shown a cynical mood occasionally, like when he told Rod Reiss that he was sticking around because he was looking for a toilet. Even so, he was able to show true admiration and respect to those who he believed deserved it, like Uri or his second in command. He could also be seen at time displaying genuine care for others, killing MPs that came near his grandfather's home so that they would not harass him, and raising his nephew Levi following his sister's passing. This care for others could also be seen briefly in his interactions with Historia in the Reiss Chapel, becoming noticeably saddened to see Historia's slavish devotion to her father's will, despite the consequences that she would face if she followed through with is plan to inherit the Founding Titan. This is not to say he was overly caring; he despised cowards and did not respect them, and cared even less for titles, not hesitating to threaten Rod Reiss, the king of the Walls. Kenny saw the world with Uri, but could not feel the same way about it Kenny later revealed that he only obeyed Rod as a plan to obtain power, and that his true intentions were always to become a Titan and gain the Founding Titan himself, which was in direct opposition with Rod's goals. After witnessing Uri and later Frieda Reiss become benevolent people after inheriting the Founding Titan, he wondered if the same thing would happen to him too. He wanted to know what does it feel like to be kind and compassionate. His grand dream was to take the Founding Titan and see the world like Uri once did. Despite his outward confidence, Kenny seemed to suffer from some degree of self-loathing, going so far as to describe himself as "garbage." His poor view of himself seemed to stem largely from a dissatisfaction with his own lack of empathy towards the lives of others, as his entire quest for power was motivated by a hope that gaining more power would make him a more compassionate person like Uri. His self-deprecating nature also manifested itself in a lack of self-confidence, demonstrated by his decision to abandon Levi when the latter was still a child because of his belief that he was not fit to be someone's parent.

Kenny Ackerman was a very tall and slim man who appeared to be well-built. He had short, coarse-looking dark hair that reached to his neck and also had a thin beard along his jawline. He had the appearance of a middle-aged man with wrinkles around his eyes, which were small and piercing. He was mostly seen wearing a simple white shirt with a black tie that was never fully done up, and a large black overcoat that reached past his knees. He also had a bowler hat with a white band around it. He was almost always seen wearing a pronounced scowl, even when making a foul joke. When not engaged in combat, Kenny, like his fellow Military Police, also fashioned a black trench coat, along with his standard attire and bowler hat. When he was younger, Kenny had a more defined face and much fewer wrinkles. He did not have a beard but he still had dark sideburns. Also, his hair seemed to be slightly longer. He used to wear a long coat, dark trousers and shoes, a white button shirt and another hat.

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 was also very fast as he suddenly appeared behind Historia Reiss' mother. Kenny's speed was once again shown when confronting Annie Leonhart: not only did he manage to traverse the distance of several meters between them and get behind Annie without her noticing, but he was also able to dodge her kick with apparent ease. Despite her incredible fighting skills, Annie immediately opted to retreat into the sewers, implying she was unsure of a victory against him. On top of that, he was the leader of the First Interior Squad, showing high leadership skills. Levi Ackerman mentions learning quite a bit from him concerning how to out-maneuver his targets, suggesting that Kenny was highly intelligent and a strategic thinker. 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 is an adept teacher.