So, you've got a character that you want to show is really dangerous. You could give him/her the normal two arms or legs, but that's just not enough. Maybe you could replace one of those arms with a really big gun, or a sword, or have it transform into something else. If that doesn't work, you can always give a character extra arms... because four arms good, two arms bad, right? Multi-Armed and Dangerous characters come in two flavors: 1) The extra arms are a regular part of the body. 2) They're made from prosthetics/synthetic materials that are usually attached to the person.