Everybody needs an anti-hero right? Now pattern includes instructions for a slip-on sleeve to give the little guy a Hellboy costume.

Just a little devil for your shoulder, or your desk, or whoever you think might need one. All appendages are knit on, no sewing, so very secure.
Techniques used are much the same you might find in a toe-up sock. Magic loop, increase, decrease, short rows and 3-needle bind off. Pattern includes reference links to technique tutorials, just in case.