Hange Zoë

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However, Hange's energetic attitude was only half of their personality, alongside a darker attitude normally kept under their usual self. They showed a psychotic side when giving a demented smile to Djel Sannes, telling him of the horrible pain Hange was going to cause him for what he did to Hange's friend, Minister Nick.
Furthermore, Hange even smiled and sarcastically joked with Sannes during his torture at Hange's and Levi Ackerman's hands.
Probably the strongest emotion Hange expressed was anger, as they were often seen flipping from calm and collected to rage-filled and threatening. However, this extreme change in personality was usually brief as they quickly calmed down themselves, and was only seen in highly urgent situations; this change of character is often marked by Hange putting their glasses on top of their head, and their cheery nature can be seen returning when they put them back down.
Story
104th Training Corps arc
During an expedition outside of Wall Rose, Hange and Levi find the corpse of a fallen Survey Corps member. Upon looking at the soldier's armband, Hange states that it is from the 34th expedition, belonging to a woman named Ilse Langnar who had died a year prior.
Hange is present among the Survey Corps as they leave Trost District on another expedition to study the world outside the Walls and lay groundwork for their eventual return to Shiganshina District to retake Wall Maria. As the crowd admires Captain Levi, Hange jokes that his admirers would be disappointed if they knew what a clean freak he was.
Hange and Mike Zacharias are assigned to take Eren to his court hearing in front of the leaders of the Military.[22] Hange is present with the rest of the Survey Corps as Levi beats up Eren and checks on his condition after the tribunal is over, noting that Eren's lost tooth grew back.