Riddick is Conan in space. I'll have to re-watch the first two films to see if this analogy holds up, but after arriving at this conclusion, it seems strikingly obvious.
A barbarian that becomes king.
Furya is Cimmeria.
Riddick even questions civilization in his first act narration -- shades of Robert E. Howard.
Analogy aside: that bit of business with catching the blade on his boot and what he did with it, too cool. I loved the first act of this movie, visual storytelling with sparse dialogue. The tail creature and his problem-solving in this act were both fascinating. I wish the rest of the movie would have continued in this vein, but...it sadly didn't. Oh, well.