> Must admit i preferred Dragon Zero, Shadownaut just doesn't do it for me, makes me think of space. Perhaps ShadowZero?
There were other things to consider too. Shadow Zero for example is the name of a creature from Seiken Densetsu, and names of many other things in an internet search. Shadownaut is more fitting to the story too (which does have a space element to it).
It's kind of growing on me. :)