The Technodrome and Google and Youtube I was able to learn that this bootleg Leonardo is a 'Karate Turtles Warrior' - sans robe and weapons:
That seemed weird initially, but then again I only had one of the four bootlegs, and as my research confirmed, all four turtles heads use the exact same sculpt with only their bandanna/wrist gauntlets and belt letters being different.
This guy is just the right combination of weird and wonderful. I'm glad I found him at the flea market, original turtle bootlegs don't pop up all that often anymore these days. I'm also glad to have found out some legitimate details about this guy. Thanks to the Technodrome forums!