Erm well I think whoever it is!
It's the actual ARK itself from the line of code deciphered here and how the the image looks!!!

"I am not a god. I am more than that. Infinitely more. I am everything. This world, this ARK, it is my body.

Rockwell became the ARK!! pic.twitter.com/eYdxiVG6gz

— 《JakeNie》 | Ahhhhhhhhhhhh (@JakeNie5) December 9, 2017