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Franz Kefka (フランツ・ケフカ)Franz is a member of the 104th Trainees Squad.
Franz first appears Ch.3 in walking through Trost District with Eren and Hannah. 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)