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Martin Springer (マーティン・スプリンガー Mātin Supuringā?) was the brother of Conny Springer and a resident in Ragako village. He was transformed into a Titan by the Beast Titan during Wall Rose's supposed breach.
Not much can be made out from his appearance, but it can be seen that he is a small boy who wore a loose shirt with shorts, small shoes, and had medium length black hair.
Martin Springer is revealed for the first time during a flashback. When Conny arrives to Ragako looking for survivors, he recalls a time when he had a happy family. Connie looks for his family heavily worried with no result. It is later revealed that Martin is one of the Titans that were created by the Beast Titan after the events of Eren and Annie's brawl in Stohess District.