Bertholdt was a rather tall, slender teenage boy. He had short, black hair, pale green eyes, thin eyebrows and an elongated face. He was seen mainly in his cadet uniform, and after he entered the Scout Regiment, he wore their uniform with the green hood on missions. He was also noted by others to always be sweating. In his casual clothes, Bertholdt wore a blue sweater with a white button down underneath and tan pants.