Franz had a large build with shaved black hair. He had grayish-brown colored eyes, and a slight tan. He wore the standard cadet corps uniform, with a dark green shirt underneath.
He was a good-natured young man, only wanting everyone to get along. He was not one to get upset or anger others. But when there was a chance Hanna Diament would be in danger, he vowed to protect her if it was the last thing he would do.
Over two years later, he is seen during a fitness assessment in the wilderness. After graduation, on the 104th Cadet Corps' last night together as cadets, a fight between Eren Jaeger and Jean Kirschtein breaks out. As the fight picks up, Mikasa Ackermann stops it by carrying Eren out of the mess hall. Franz also blocks Jean's path, nervously convincing him that the fight was over.
The next day, Franz watches the Scout Regiment depart with Hanna and Eren. He and Hanna begin chatting, optimistic that things are looking up for humanity. Angered, Eren begins yelling at them, calling them a couple, embarrassing both of them.
Later, Armin comes across Hanna frantically trying to revive Franz's mutilated body with CPR.
- Franz's name is remarkably similar to Franz Kafka, a Czech writer considered to be one of the most influential authors of the 20th century. Franz's lover, Hanna Diament, shares the same last name as Dora Diamant, who was the lover of Franz Kafka during the final year of his life.
- In the Japanese version of the anime, Franz's voice actor also dubs Sawney.