This is a very simplistic version of the Teenage Mutant Ninja Turtles. Upon further investigation (aka Google Images), I discovered that this is a reasonably popular design, so excuse my unoriginality.
Michelangelo, Raphael, Donatello, Leonardo
For the base I used Xtreme Wear Green With Envy. For the face band mask things(?) I used XtremeWear Sunkissed, Cherry Red, Zoya Mira, and Xtreme Wear Blue Me Away!. The eyes are SinfulColors Snow Me White and Xtreme Wear Black Out.