Following from last Tuesday's post, here's Shredder's long-time nemesis, and the Turtles' mentor and adopted father--Splinter:
The aim here was to make Splinter appear as serene as possible, reflecting his wise, zen-like approach to life. The tree in the background is supposed to be bonsai-like. Or maybe it is a bonsai tree, grown huge as a result of exposure to radioactive mutagen?
This series illustrating TMNT supporting cast members follows a series from last year depicting the Turtles themselves: