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Hannah Diamant (ハンナ・ディアマント)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.
Manga: Ch. 3 "The Night Of The Disbanding"
Anime: Ep. 3 "Shining Dimly in the Midst of Despair"
(Source: Shingeki no Kyojin Wikia)