Hanna was a short girl with a small build. She had long ginger hair tied back with a red hair tie, green eyes, and freckles on her cheeks. She wore the typical uniform of the 104th Cadet Corps with a white shirt underneath her jacket.
Hanna was a bright, cheerful girl, shown when she happily agreed with Franz Kefka that hopefully the Titans would not return. However she appeared very shaken when Trost District fell as she accepted comfort from Franz. She became very frantic and delusional when Franz died and she constantly attempted to resuscitate him with CPR despite him being torn in half.
Over two years later, she is seen during a fitness assessment in the wilderness. After graduation, along with Franz, Eren, Mikasa and Armin, she watches the Scout Regiment departing Trost District. Hanna mentions that everyone has cheered up since the fall of Wall Maria. Franz then states that hopefully the Titans will not come back due to the reinforced cannons and Hanna happily agrees. In response, Eren teases them about being a couple. Both blush in embarrassment and deny being in a relationship.
Hanna is later encountered by Armin Arlelt shortly after the loss of his squad. He finds her out in the open, frantically attempting to revive Franz with CPR. Though he attempts to make her realize that Franz has been torn in half and cannot be saved, she ignores him and continues her futile efforts.
- Though her death is not portrayed in the Attack on Titan anime, it is confirmed in the Attack on Titan Character Directory.
- Hanna is a Biblical name of Hebrew origin, meaning "Grace". Her surname, Diamant, means "diamond" in various languages; including German.
- She shares the same last name as Dora Diamant, who was the lover of Czech writer Franz Kafka for the final year of his life.