Hange Zoë

Hanji Zoe is a Squad Leader from the Scouting Legion. She conducts research on Titans and, as such, is deeply interested in Eren Jaeger, who can turn into a Titan.

Personality
Hanji is very passionate about her work. She can be seen as very hyper and very active, often diving into her work without thought for personal safety and documenting the experiences. However, her lectures are very boring and astute soldiers quietly leave the room before she begins one.

Hanji is often excited by Titans and is always eager to experiment with them, coming off as extremely emotional regarding titans. For example, she cried at the amount of pain she was giving a titan during one of her experiments.

She explained her strange actions to Eren as a way to see titans from a different perspective and learn new insights that would normally be overlooked from the traditional views of rage.

However, Hanji still cares deeply for humanity and her comrades as seen in Ch.34 when she confronted Pastor Nick for his coverup of the Wall. When he refused to talk, she personally grabbed him and held him over the side of Wall Sina, explaining that lives were lost because of him and his religious faction and that she holds him in utter contempt.

Current Plot
Hanji Zoe is introduced in Ch. 19 when she takes Eren to his military hearing in front of the leaders of the human military. She is present with the rest of the Scouting Legion as Rivaille beats up Eren and checks on his condition after the tribunal is over, noting that the gap where Eren lost his tooth earlier is fast disappearing.

All of her experiments with captured Titans "Sonny" and "Bean" turned up no new evidence which is why Hanji is so excited to work with Eren.

Later, when Eren and the Special Operations Squad are at the former Scouting Legion HQ, she begins to prep Eren on her experiments, but ends up talking until morning when she is interrupted. Hanji was about to talk about the curious precedent involving Ilse Langner when it was discovered that Bean and Sonny were murdered.

Although devastated by the loss of her test subjects, Hanji moves forward with her experiments on Eren. When it turns out Eren cannot turn into a titan at will, she is a little disheartened. However, seeing Eren's titan hand later on got her very excited, unexpectedly breaking the tension between Eren and the Special Operations Squad.

She discovered that Eren's titan powers are only awakened when he has a clear objective in mind, such as defending against the cannonball. She also theorized that this switch must have a good reason as well as being connected to the titan's nature.