Board Thread:Theories/@comment-124.106.131.67-20160402184737/@comment-25322628-20160407010542

So far, we know that Eren, Ymir, B and R, Annie and Zeke are the Titan Shifters currently alive.

Ymir was a regular Titan that ate a shifter affiliated with R and B, Annie and Zeke and returned to human form, so the Homelanders view her as an enemy, the same as Eren.

Grisha was a shifter along with the Reiss family members that had the Coordinate power.