What makes a Demon a Demon

There is a beautiful blue Demon in the classified section and farther down in his description he mentions a slant six, and 7.25 axle. When I think of a Demon I think 340, 8.75 , 727 or 4 speed. I'm not questioning the integrity of the seller, I just need educated on what makes a Demon a real Demon, and is it denoted as such on the fender tag?