Hannah is a member of the 104th Trainees Squad.

Hannah first appears in Ch. 3 walking through Trost District with Eren and Franz. Eren refers to Hannah and Franz as a couple, which they both embarrassedly deny.

First Appearance

Manga: Ch. 3 "The Night Of The Disbanding"

Anime: Ep. 3 "Shining Dimly in the Midst of Despair"

(Source: Shingeki no Kyojin Wikia)