Captain of the exploration troops. He is considered the best "soldier of humanity" because of his great abilities. He is neat and possesses a bad character. Before joining the legion of recognition he was a famous criminal in the Underground city. His exact age is unknown, but the author says he is around 30. Later on he discovers that, on the side of his maternal family, he is part of the Ackerman clan, as is Mikasa. This clan of oriental origin, was known to be the only ones, who were not erased their memories by King Karl Fritz, and by not wanting to submit to it they were persecuted until almost extinction, and according to the legend they are a « byproduct of the Science Titan ». He is the protagonist of the play spin off "No regrets" where he gives more knowledge of his past.