Franz has his brown hair in a buzz cut and dark eyes. He wears the typical Attack Junior High School boys uniform.
Franz is a kind person who enjoys being around Hanna. Like Hanna, he is not willing to admit that the two of them are dating.
Franz and Hanna are embarrassed by Jean calling them a couple and deny the relation.
During recess, Franz tries some of Hanna's food.
In the school's 104th festival, Franz helps at Eren's chee-burgs stand. After Armin is prepped to be their salesperson, Franz blushes at how Armin looks in his getup, and a jealous Hanna shoves him for it. He later carries Hanna and flees when Titans appear and steal all of the food stands.
When teachers get in the way of Eren trying to head to the Titans' building to retrieve his chee-burgs, Franz, along with his classmates stand up for him and come between them. He later watches Ilse Langnar's broadcast of Eren and the others venturing into the principal's office, and cheers once Eren manages to retrieve a chee-burg.
- Hanna Diament - Franz and Hanna are dating; however, Franz is hesitant about revealing their relationship status to their peers.