Roger is an older, middle-aged man. His dark hair is closely shaved and he has a receding hairline. He dresses in the standard uniform of the Military Police Regiment and wears vertical maneuvering equipment, though he is not seen making use of it.
Although he presents himself as a calm, collected, and professional soldier, Roger is very cruel. He takes great joy in taunting Flegel Reeves before trying to kill him, and becomes upset when he does not get the emotions he wants out of the boy. Roger is very careless in his conduct, freely divulging Military Police secrets to Flegel under the assumption that the boy will soon be dead and unable to pass the confessions along to anyone else, failing to account for possible eavesdroppers.
After Dimo Reeves's body is discovered in Trost District, Roger demands that Erwin Smith be summoned. Upon Erwin's arrival, Roger claims that Reeves was working with the Scout Regiment to keep Eren Jaeger out of the Military Police's hands in order to monopolize Eren's Titan abilities, and the Scouts killed Reeves in order to cover their tracks. He informs Erwin that the Scouts will have to appear before the Royal Government to plead their case and prove that they are innocent in Reeves' murder.
Roger is next seen pursuing Flegel Reeves through Trost, finally cornering him in a damaged section of the district. After belittling Flegel, and taking a moment to rejoice that he will not be killed for leaving Flegel alive, Roger prepares to execute the boy. Before he kills Flegel, he decides to indulge him and inform him of why the Military Police killed his father, admitting that it was because he chose to ally himself with the Scout Regiment. Unhappy that Flegel does not seem afraid of him, Roger prepares to kill Flegel, but is interrupted by Hange Zoë and Moblit Berner, who quickly disarm him and his men.
Roger is even more surprised to find that the damaged buildings around him are not abandoned, and are in fact filled with citizens who have overheard his conversation with Flegel. He begins threatening them, claiming that anything they say will be silenced by the Royal Government, but is interrupted by Flegel, who sits down on his head and declares that the Reeves company will protect Trost from the Military Police.