Carlo was a young Marleyan boy of short stature and slim build. He had a rounded nose and short red hair parted down the middle. He wore round-rimmed glasses at all times as well as the standard Marleyan military uniform.
Over a month later, Pieck reunites with her Panzer Unit while she and Porco Galliard are escorted away from the Liberio internment zone festival by a mysterious bearded soldier. Suspecting treachery, Pieck warns her Panzer Unit secretly to follow them from a distance.
When Pieck and Galliard are captured by the soldier, Carlo and his comrades come to their rescue. Realizing they are under attack by the Attack Titan, Carlo and the others in the Panzer Unit quickly prepare the Cart Titan's artillery armor for battle.