Ymir

The 104th cadet who stole the Jaw Titan.

Ymir is a member of the 104th graduating class and romantic partner of Krista. She remains distant from her other classmates and is both harsh and critical, maintaining an air of indifference. When titans attack Castle Utgard, Ymir transforms into a 5 m chimpanzee-like Titan that, despite its smaller size, is nimble enough to take down several large titans with its speed, claws, and teeth.

Quick Facts

Affiliation: 104th Training Corps
Titan: Jaw Titan (taken from Marcel Galliard)
Titan form: 5 m chimpanzee-like Titan
Japanese voice: Saki Fujita
English voice: Elizabeth Maxwell

Facts from the source article.

Background

Prior to the events in the series, Ymir was a nameless Eldian orphan living in Marley who was picked by a cult leader to pose as a royal descendant and religious figurehead. When Marleyan security forces later cracked down on the cult, she was scapegoated and sentenced to exile on Paradis as a Pure Titan. Ymir remained a mindless Titan for sixty years until one day she chanced upon four teenage Marleyan Warrior infiltrators and devoured one named Marcel Galliard, who happened to possess the Jaw Titan. Consuming a Titan Shifter allowed her to return to her human form. She later joined the Training Corps and became close with Krista Lenz (Historia Reiss), of whom she is extremely protective.

Some time after Krista becomes queen, Ymir sends a letter to her where she states her impending death. This is later confirmed by Porco Galliard, who reclaimed his brother Marcel's power of the Jaw Titan.