That dragon is in some many dismembered parts. Now this dragon really reminds me of Nadia Fortune from Skull Girls and Buggy from One Piece, since those characters can dismember themselves into moving parts.
glad you do c: decided to go with the eastern dragon approach rather than western liek you originally specified. It's just easier to incorporate the clever idea of missing portions into an eastern dragon body then a western dragon one.
The lore explanation is that ray man is made of the energy stuff that you collect during the game. At the time of his creation, there wasn't a lot of this stuff, so he didn't have any arms or legs or neck, just separated parts of the body.