Sneaky is aqua green, with magenta wings and light yellow spines.
Sneaky has shown himself to have something of a mischievous streak. When not being attended to by Astrid, he appears to like perching himself on people's heads as he did with Snotlout, Ruffnut, and Alvin.
Stealth: Astrid trained Sneaky to be extremely stealthy and as Tuffnut commented, 'Sneaky!'. For example, when Meatlug had been captured by Alvin, Savage and Mildew, he perched on top of Alvin's helmet without him noticing and tricked Savage into hitting Alvin over the head with his sword, temporarily stunning him.
Speed: Sneaky is also shown to be fast enough to fly from one person's head to another without the person realizing that he had moved at all, without making any noise whatsoever.
Sneaky, at the top left corner, in "Worst in Show"