Carla Yeager was the former waitress of a bar in Shiganshina District, the mother of Eren Yeager and the second wife of doctor Grisha Yeager.
Carla was an attractive, fair-skinned woman of medium height with a slender build. She had large light eyes, long dark hair tied loosely, hanging on her right shoulder with bangs on each side and only a few short hairs kept loose on her forehead. When she was seen inside her home, Carla wore a cream-colored sweater with frilled sleeves and a long red skirt with a white apron and small tan boots.
Carla had a kind, willful, and concerning nature, reprimanding her friends and family for dangerous decisions. This was mainly seen during her interactions with Eren when he wanted to join the Survey Corps, showing her motherly care. Unlike Shadis, Carla was more content with the simple aspects of life and did not believe that is necessary to be acknowledged by others, seeing that existing is special on its own.
Appearance: Carla was an attractive, fair-skinned woman of medium height with a slender build. She had large light eyes, long dark hair tied loosely, hanging on her right shoulder with bangs on each side and only a few short hairs kept loose on her forehead.
Personality: Carla had a kind, willful, and concerning nature, reprimanding her friends and family for dangerous decisions. This was mainly seen during her interactions with Eren when he wanted to join the Survey Corps, showing her motherly care.
History: During her youth, Carla worked as a waitress in a small bar that Keith Shadis frequented. One day, Keith brought along Grisha Yeager, who had recently been found lost outside of the Walls.
Carla Yeager in the story: Carla is first shown forbidding Eren to join the Survey Corps after Mikasa spoke of Eren's desire to join the military. Though Eren's father, Grisha, remained passive and even encouraging of Eren's ambition before leaving the house, Carla continues to attempt to convince Eren otherwise, leading Eren to yell at her and run off to ignore her protests. Upon this, Carla tasks Mikasa with looking out for Eren, saying he needs to be protected from himself.
Source: Attack on Titan Wiki, available under CC BY-SA 3.0.