|I'm glad. To fight alongside you for the same goal again.|
|— Louise to Mikasa before heading into battle|
Louise (ルイーゼ Ruīze?) is a member of the Jaegerists. When she was younger, Louise and her mother were attempting to flee Trost District during a Titan invasion, where she was saved by Mikasa Ackermann. Four years after the Struggle for Trost, Louise participated in the Raid on Liberio as a Scout Regiment soldier. After the military imprisoned Eren Jaeger, she helped leak information of his situation to the public.
Louise has shoulder-length blonde hair which she keeps parted down the middle. When she was younger, her outfit consisted of a tawny brown jacket which she wore over a white shirt and gray skirt. Her current civilian clothes consist of a simple sky blue long-sleeve shirt and a long white skirt. When on duty, she can be seen wearing the standard Scout Regiment uniform.
Louise believes that strength is the most important attribute one can have in the world, to the point that she almost seems to have a "might equals right" mentality. Much of this mindset stems from her experiences during the Battle of Trost District, where she claims to have learned from watching Mikasa Ackermann fight in the face of adversity to achieve victory. She believes that the ends justify the means, and has no qualms about breaking rules if she believes that disobeying others will get her what she wants.
Louise is among the many citizens who are trapped inside the city because Dimo Reeves, a merchant and the head of the Reeves Company, was barring the gate with his cargo. Louise's mother assures her that her father will kill the Titans with cannons, but Louise spots an Abnormal Titan charging towards them. The Titan is quickly slain by Mikasa Ackermann. Mikasa gets Reeves to move his cart through use of threats and Louise and her mother express their gratitude towards Mikasa before she leaves to rejoin the battle. Mikasa salutes them and Louise, ecstatic, salutes back. The experience inspires Louise to enter the military as well, joining the Scout Regiment in order to get closer to Mikasa.
In the year 854, Louise is one of the Scouts who participate in the infiltration and attack in Liberio. Amid the conflict, Louise watches Eren unsuccessfully attempt to devour the War Hammer Titan and later takes cover from the Beast Titan's projectiles. She tries to assist Jean in killing the Cart Titan's operator, but is forced to flee by Theo Magath and other Marleyan soldiers.
As the Scouts' airship arrives, Louise joins her comrades in retreating to it. On board the airship the Scouts begin celebrating their overwhelming victory against Marley. As they are celebrating, two children board the Corps' airship and open fire, gravely injuring Sasha Braus. Louise tries to help stabilize Sasha and keep her alive, to no avail.
When the Scouts return to Paradis, Eren is arrested for acting against orders. Unhappy with Eren's treatment, Louise is among a handful of soldiers who leak the information of Eren's arrest to the public to try to force the military to release Eren. After they are found out, Hange Zoë arrests Louise and her compatriots as well.
Mikasa takes Louise to the cell she will be staying in, and Louise is disappointed to learn she will not be staying in the same cell that Mikasa was imprisoned in. Louise tells Mikasa that she does not regret spilling the secrets of Eren's arrest to the press, explaining that she has believed ever since Trost that one must be ready to fight when threatened. Louise tries to appeal to Mikasa to help free Eren, but Mikasa coldly cuts her off. As Mikasa leaves, Louise salutes her.
The rebels are freed from their cells by guards who have also sided with Eren, and rendezvous with Eren himself outside of the city. Eren declares that his next objective will be to locate Zeke Jaeger.
When Marley's forces launch a retaliatory attack against Shiganshina, the Jaegerists are forced to release their imprisoned soldiers so that they will have extra manpower. Louise visits Mikasa to let her know that she is happy to be fighting alongside her again, although Mikasa is unconcerned.
- Mikasa Ackermann - After Mikasa saved a young Louise and her mother during the Battle of Trost, Mikasa left an indelible impression on the girl. After this, Louise began idolizing Mikasa, which ultimately became her primary reason for joining the Scout Regiment. Years later, Mikasa reunites with Louise but is slightly put off by her constant idolization and also disapproves of how she has decided to follow Eren and the Jaegerists. Nevertheless, Louise continues to look up to Mikasa for strength and leadership, wanting to get closer to her.
- Eren Jaeger - Although she does not appear to be as devoted to Eren as some of the other rebels, Louise still believes that Eren will be the one who will save Paradis and is willing to follow him instead of the military. She believes in Eren's strength enough that she is willing to endanger herself by going against the military.
- Three members of the Panzer Unit