Board Thread:Manga/@comment-32563139-20170717125925/@comment-4929778-20170717155357

I heard the theory that our eren is a reincarnation of Krueger which is why they look so similar and he had his memories. In the manga the first scene is of an older mikasa saying see you later eren and most people think that it's Krueger's memory and eren received it which would make sense. That eren was a member of the psa and a restorationalist so his job would likely take him internationally and he'd likely see an Asian. This world is meant to be different from ours but some things are still similar. And because Titans can be reborn into children maybe Kruger's fractured memories were into eren.

Additionally all eldians are connected via paths. To make it simple think of it as a plant with the eldians as roots from the vines and the vines all correlating at one plant aka the founding Titan. This could very easily be why a lot of characters look similar i.e. Carla could pass for Frieda despite probably sharing no blood; gabi looks like eren or Frieda despite probably not being related; etc. Once one path goes another takes it place.