ROCKSTEADY! On the original TMNT cartoon series he was always one of those characters I envisioned being way more of a badass. He's a f-ing Rhinoceros for criminies sake!!
Actually, in the first episode all of the bad guys were a little more menacing..but got progressively less hardcore and more bubbly as the show grew in popularity so as to be more "kid friendly." Watch it again and see if you don't hear Shedder talking about creating "killers" if you don't believe me...
At any rate, I had fun creating this one, as re-envisioning is always fun to me!