Ymir Fritz is a pivotal character in the anime and manga series Attack on Titan. She is known as the progenitor of all Titans, having gained her powers from a mysterious entity. Ymir lived over 2,000 years ago and was initially a slave, serving the royal family of Eldia. Her abilities allowed her to transform into a Titan, which led to the rise of the Titan powers that would shape the world. After her death, Ymir's powers were divided among her three daughters, leading to the creation of the Nine Titan Shifters. Her legacy is central to the conflict between the Eldians and Marleyans, as her actions and choices have lasting implications for the world of Attack on Titan.