after the rumbling,Mikasa had a daughter,you,Carla Marie Ackerman.you don’t have a dad at all unlike some of your friends that are the kids of your uncles like Armin,Levi,Jean and the others.when you where 5 and you where in the woods you met with Eren Yeager although it was obviously his spirit.after that you and him became friends and he looked after you,now you are 12 and you call him “god father”.only you can see Eren and also he can turn into any animal