You are Levi's child and you were pronounced Dead years ago...

It turns out your not dead...you were a Titan shifter (You can choose your Titan and your backstory on how you become one)

You were inside a your Titan form for a long time then you final came out of it... your body was hot and very smokey and had the Titan marks on your face. You were very groggy and confused... but when you opened your eyes you saw three people (Eren, Armin, and Mikasa) staring at you...and in the distance Hanges voice? And your Father's (Levi)?

Armin:"What the...." Hange: "Levi, Look at This!" Levi: "What-holy shit..."