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Ymir's dark hair is clipped to the back of her head with a red clip in a low ponytail. She has brown swirly eyes and freckles. Like her fellow cadets, she wears the standard uniform.
Ymir is somewhat hostile to those she is not close with. She is protective of Christa and acts abnormally warm towards her. As such, she never leaves Christa's side. Ymir cherishes her time with Christa and intends to spend every minute of her day with her. This is shown when Christa suggests bringing a friend to go shopping with them, however, Ymir suggests that they should go alone.