|I don't believe it. For the first time in human history... I communicated with a Titan.|
|— Ilse as she writes in her notebook.|
Ilse Langnar (イルゼ・ラングナー Iruze Rangunā?) was a member of the Scout Regiment. She was a participant of the 34th expedition beyond the Walls and was in charge of the left wing of the second brigade. She wrote very useful information about a talking Titan she encountered in a notebook that later aided Hange Zoë's research.
Ilse was noted to have resembled Ymir in appearance. She had short black hair that was parted to the right side, lightly tanned skin, and gold-colored eyes with a small patch of freckles below each one. She wore the standard Scout Regiment uniform and cape with a gray shirt underneath.
Ilse appeared to be quite emotional, yet brave, trying to stand firm in moments of despair. She seemed to be a very devoted and smart soldier. She also cared about her family, seen during her last moments as she regretted not being able to give anything back to her parents. Ilse thought of herself as a proud member of the Scout Regiment and was resolved to do whatever she could. Though she took what time she could to document any information she could obtain from the Talking Titan, she lost her level headedness when she brought up the subject of eating humans and began screaming at the cowering Titan before running away in fear.
Storyomni-directional mobility gear broken, she abandons her equipment and flees afoot north to a nearby forest, trying to find a route to reach the Walls. Knowing that her chances to make it are very low, she takes out a notebook and begins writing her experiences in the hopes that they at least will be useful to humanity.
After profuse running, she inadvertently runs into a Titan, which chases her and corners her against a tree. However, instead of immediately eating her, the Titan hesitates and she questions if it is an abnormal. It then somehow starts talking, saying "a subject of Ymir" and "Lady Ymir... Well met," while bowing.
She is thoroughly confused that the Titan can form speech, and questions it about what the Titans are and where they came from, writing every question and the Titan's reactions in the notebook.
However, the Titan does not respond, and instead moans and looks increasingly frustrated. She angrily yells at it asking why Titans eat humans and what their objective is; calling them useless lumps of flesh that should disappear from the world. The frustrated Titan begins to tear off its cheeks, ripping off flesh and squirt blood.
Horrified, Ilse attempts to flee but is quickly caught by the Titan. As the prepares to devour her, she hurriedly continues writing in her notebook of what is occurring, until the Titan bites off her head. After killing her, rather than eat her, the Titan leaves her body inside of a tree.
One year later, the Titan that killed Ilse attempts to kill Hange Zoë before returning to the tree Ilse's body is hidden in. After it is killed by Levi, Ilse's body and notebook are found and recovered.