Samuel is a young man of average build and height, with dark brown hair and silver-colored eyes. His complexion is slightly tanned, and his hair is parted in the center with bangs and faint sideburns. He wore the typical uniform of the 104th Cadet Corps with a light green shirt underneath.
Little is known about Samuel's personality. He appears to be a fairly normal young man, concerned for the well-being of his friends and eager to join in celebrations.
On the day after the 104th Cadet Corps' graduation, Samuel's team is sent to clean the cannons mounted along to the top of Wall Rose in Trost District. The group discuss which branch they intend to join and Sasha Braus reveals that she has stolen meat from the officers' rations. Initially fearing punishment for the theft, the group eventually decide to partake in it with Sasha.
The sudden appearance of the Colossal Titan causes all of the cadets to be knocked off the Wall, and Samuel is knocked unconscious by flying debris. He is saved by Sasha, who catches him by launching one of her Omni-directional mobility gear hooks into his lower calf.
- His name could be a reference to the American actor Samuel L. Jackson.