Gunther Schultz was one of the Survey Corps soldiers hand-picked by Captain Levi to join the Special Operations Squad.
Gunther was a man of average height with a slightly darker skin tone. He wore a short crop of brown hair that was kept to a point on the back of his head. As most of the soldiers, his attire consisted of a short light brown leather jacket with the badge of the Survey Corps on both shoulders, on the front left pocket and on the center of the back, a light-colored shirt, a dark brown sash around the waist covering the hips, white pants and dark brown knee-high leather boots. Additionally, he was often seen wearing a green cape that the soldiers usually use for traveling with the symbol of the Survey Corps on his back.
Being a soldier of the Survey Corps who survived multiple encounters with Titans significantly affected Gunther's personality. According to Levi, Gunther was chosen to be the part of the Special Operations Squad not only for this strength, but also due to the fact that he did not completely trust Eren Yeager. Even though Gunther and others were able to live through because of their ability to always expect the worst in any situation, they did not turn into heartless beasts as it was not easy for them to point their blades at Eren. In the Special Operations Squad, Gunther seemed to be the most reasonable one. After Eren's unintentional transformation into a Titan, he was the only one to ask Eren for proof that he is not hostile. In contrast, Oluo threatened to kill him and Petra thought of Eren as dangerous while worrying about Levi's life. However, he was shown to be irritated when his comrades and Eren were jokingly mocking each other about having wet their pants, implying he also possessed a stern side and did not take kindly if a soldier did not focus on the task at hand.
Appearance: Gunther was a man of average height with a slightly darker skin tone. He wore a short crop of brown hair that was kept to a point on the back of his head.
Personality: Being a soldier of the Survey Corps who survived multiple encounters with Titans significantly affected Gunther's personality. According to Levi, Gunther was chosen to be the part of the Special Operations Squad not only for this strength, but also due to the fact that he did not completely trust Eren Yeager.
Gunther Schultz in the story: After the post-Trost District battle trial to decide Eren's fate concludes with Eren joining the Survey Corps, Gunther is chosen by Levi to be a member of the Special Operations Squad, a group of elite soldiers whose job is to look after Eren. Gunther, along with the rest of the squad, then accompanies Eren to the former HQ of Survey Corps, which will now serve as a hideout for Eren. After their arrival, Gunther and Eld notice that the HQ has not been properly maintained due to being unused.
How Gunther Schultz echoes later: While speaking to Historia under the Reiss chapel, Eren mentions Gunther as being among the victims he and Grisha Yeager are responsible for killing by stealing the power of the Titans. Later in the Battle of Shiganshina District, as Erwin Smith begins to lament the dwindling hopes of his dream, Gunther stands among the many fallen Survey Corps soldiers in Erwin's mind, wanting to know if their deaths had meaning. In the forest, as Levi contemplates all the times he risked his life to save Eren, Gunther appears among the comrades he had lost along the way.
Source: Attack on Titan Wiki, available under CC BY-SA 3.0.