Board Thread:Theories/@comment-24894791-20160325014734/@comment-27938131-20170820170120

Levi isn't japanese. What connect them is their Ackerman roots, through his mother for Levi, and her father for Mikasa.

And about Japanese, the people with that heritage are called Asians, and the only characters of this ethnicity we know so far are Mikasa's mother and, well, Mikasa, who'd be Eurasian.