Martin Springer (Anime)

Martin Springer (マーティン・スプリンガー) 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.

Human
Martin was a small boy, who wore a loose green shirt. He has medium length dark blond hair and bright, yellow-colored eyes.

Clash of the Titans arc
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. Conny looks for his family heavily worried with no result. It is later revealed that Martin was one of the Titans that were created by the Beast Titan after the events of Eren and Annie's brawl in Stohess District. His Titan is eventually killed at some point before Wall Rose was declared Titan-free.