Keiji

Keiji was a loyal soldier of the Survey Corps. He seemed to have a volatile personality, as seen when he lost his temper after Annie sealed herself inside of a crystal, repeatedly stabbing at it while cursing her and demanding that she pay for her crimes. He also seemed to be somewhat impatient, yelling at Eren for disobeying orders to stay hidden in favor of killing a Titan. Keiji also seemed to be rather blunt in his speaking, casually commenting that Ymir was not normal due to her Titan abilities while speaking with Eren, seemingly unconcerned with how Eren, an Intelligent Titan himself, would feel.

Keiji was a tall, tan soldier with a large build. He had dark hair with some lighter shades near the base of his skull, which he kept in a buzz cut. He had visible lines under his eyes and rather defined cheekbones. During missions, he was shown wearing the standard Survey Corps uniform. His civilian clothes consisted of long, dark pants, a long-sleeve short with a short-sleeve t-shirt over it, as well as a jacket that he would occasionally wear.

Despite never being seen in actual combat, it is implied that Keiji was a fairly capable fighter, as he survived the 57th Expedition beyond the Walls, during which he directly engaged the Titan horde that was attempting to devour the Female Titan, and a fight against the Female Titan during the capture operation in the Stohess District. He participated in the fight at Utgard Castle and against the Colossus Titan, both of which he survived. All of these facts prove his exceptional skill and reliability as a soldier.