Gelgar was a young man who had brown hair that he styled in a pompadour. He had a prominent nose, and wore the traditional Survey Corps uniform.
He was very serious about his job, and believed strongly in Mike Zacharias' decisions and abilities. But when given the chance, he was also able to relax when he or his subordinates were not in danger. And like many of the Military personnel, he enjoyed drinking alcohol.
Gelgar is one of several soldiers including Henning, Lynne, Thomas, and Nanaba, that are brought by Mike Zacharias to oversee a group of potentially untrustworthy Survey Corps recruits. The group is assembled close outside of Wall Sheena, and disarmed of their weapons due to the suspicions that one of their numbers might be an accomplice to Annie Leonhart.Before an investigation can begin, Titans appear within Wall Rose. Mike orders the group to split into four squads to warn the nearby villages; Gelgar is placed in charge of the South squad. They eventually make their way to Ragako village, Connie Springer's hometown. After noticing the lack of blood and bodies, as well as the stable full of horses, he and Lynne try to keep Connie's hopes up about potential survivors. He then leads his team to investigate Wall Rose for breaches, but rejoins with another group coming from the opposite direction; who also found no signs of a breach. As night falls, the two groups take refuge in Utgard Castle. Utgard Castle soon comes under attack from numerous Titans capable of moving during the night. Since the soldiers who had been under suspicion do not have vertical maneuvering equipment, Gelgar and Nanaba take the lead in engaging the Titans. However, Gelgar quickly runs out of swords and, after sustaining a head injury, loses the strength to continue fighting. He falls off the Wall and is thrown into one of Utgard Castle's rooms by a Titan, after Nanaba intervenes trying to save him. Spotting a bottle of alcohol on the floor, Gelgar is happy that he will at least have a final drink before dying; however, the bottle turns out to be empty, and Gelgar spends his final moments demanding to know who drank it. A Titan then reaches through the window and eats him.
As Erwin Smith contemplates his role as Commander of the Survey Corps and the lies he has told his comrades, he envisions himself standing atop a mountain of corpses of the soldiers he sent to their deaths. In his mind, Gelgar is with Nanaba and Mike at the top of the corpse mountain, staring back at him.
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