I was thinking celestial but yeah Amaterasu makes a lot more sense for a Japanese mystic meant to corral the spirits of the islands. Though honestly with Yuki being a celestial kitsune and us seeing an Atlantean celestial it’s entirely possible that powerful kami could be celestial in nature and that takamagahara could just be the celestial realm by a different name and the current saint is a Japanese priestess.

Always fun to see what observations can spark off from other comments and I think I’ll at least assume the Amatsukami are Celestials unless otherwise stated by Sage in commentary or the comic.