Eldians are a fictional ethnic group from the anime and manga series Attack on Titan. They are known for their unique ability to transform into Titans, giant humanoid creatures. This ability is tied to their ancestry, as they are descendants of the Ymir Fritz, the progenitor of all Titans. Eldians often face discrimination and persecution due to their powers and historical conflicts. In the story, Eldians primarily reside in the nation of Marley and are often marginalized. The series explores themes of oppression, identity, and the consequences of power through the experiences of Eldians, particularly characters like Eren Yeager and Mikasa Ackerman.