TMNT: Elder Leonardo Ninja Turtle Santa by Josh Purple

Sure, why not :) ! 

TMNT: Leo kills The Shredder

I was (surprise!) a big Turtles fan as a kid, on the basis of the action figures and the cartoon.  I didn't read the comic it was based on until much later.  I have no idea how Kevin Eastman and Peter Laird spun their weird, violent parody comic into millions of dollars, but mad respect to them for it.  The first issue is the Turtle's origin story that culminates with a classic rooftop battle against the Shredder and his elite Foot Soldiers.  The turtles kill everyone and Leonardo stabs the Shredder...but leaves him alive enough to commit seppuku afterword.

 Eastman/Laird's version.

My take.