I like posting about papercraft from years gone by because many who are new to the hobby may have never seen them before. This Knuckles the Echidna model was created in 2012 by one of my favorite papercrafters, Destro2k. Knuckles, as you probably know, is a character from the Sonic the Hedgehog series of video games. Destro's template for the model may be downloaded here.

Previous Sonic Paper Models:
Miles Prower (Tails)
Sonic the Hedgehog 2 Power-ups
Sonic Paper Toy