Krang, also has a large humanoid body to move around in, it looks like a beefy plasticized neanderthal from the future with 1980s shades, a forked antennae, and with a compartment in it's mid-section for Krang. I didn't want to be too literal, so this is my interpretation of that TMNT villain as a MACRODON.
from the cartoon:
from the comic:
the toy:
and Photoshop:
