Mikasa Ackerman

Mikasa Ackerman (ミカサ・アッカーマン) is the adopted sister of Eren Jaeger. She is fiercely devoted to Eren ever since he saved her from human slavers. Thus, while she sometimes does not agree with what Eren does, Mikasa will protect Eren from any who try to harm him. She, along with Armin, joins the Scouting Legion to help Eren retake Wall Maria. Mikasa is considered a military genius and was ranked at the top of her graduating class.