Well, I have a few comments, and I am sure others will have some also, but anyways, here goes nothing:
First, The CR's need to be increased.
Second, drop the alignment subtypes, as it is a dragon, not an outsider.
Third, the creatures climate/terrain is whack, I suggest you change it, as if ruins is it's only habitat it won't really be able to go anywhere I suggest you change it to any mountains and underground or some such, something a little more 'normal' so to speak
I hope this was what you where looking for, if not, I refer you to the last line of my tag.
If this orochi is based on the movie, then it is a hydra type creature and yes, it would be a outsider.. but more importantly it would be a single creature... not a race of them.