Kompletely Kroot
This is from an alien race called the Kroot. They're a bunch of hyper-evolving bird like aliens, from the far eastern fringes of the Milky Way galaxy. Think the Predator from Predator, and you won't go far wrong.
These fella's consume the flesh of their enemies and adapt the useful traits into their own DNA. For this model, i converted them to have captured a Tyranid Zoanthrope, presumably to have a nibble and gain it's impressive psychic powers.