JC from Big Buck Bunny, also known as 'The Rabbit', or simply Bunny! His original rig by Nathan Vegdahl has been updated to work in Blender 2.7x by Wayne Dixon and Hjalti Hjalmarsson. All materials now render in Blender Internal (legacy) as well as Cycles (supported).
Original Rig by Nathan Vegdahl, updated by Wayne Dixon
Press 'N' in the Viewport to access the rig UI under the tab 'Misc'. However, due to a built-in safety in Blender, this appears only if you saved and reloaded your newly created file first (the rig UI script is linked in with the character, but not immediately registered).