This is Zero, the incomplete experiment and the leader of the other experiments. Seeing as it is just a head right now, Zero's full capabilities are unknown but it is known that it can communicate to the other experiments telepathically.

It's hard to tell but Zero's coloring is as follows:
Grey skin (very thin fur)
Yellow inside the empty sets (the 0's with the slashes through them)
The veins going into it are pumping in red blood and the liquid preserving it is green.

Zero © MEEEEEEEEEEE!