You’re Eren Jeagers sister. You grew up along side Eren Jeager, Mikasa Ackerman, and Armin arlert. Meaning after Shiganshina fell and father injected Eren with the Titan serum he gave you a vial too. The story starts with you and your friends joining the cadet corps. You’re a very skilled fighter and smart, you quickly excel in every category. But the battle of trost happens. You are eaten first every one thinks you’re gone. Eren watches his sister get eaten and gets reckless and gets eaten himself.