YAMABUKI OGON (yah-mah-boo-key oh-gon) Illustration is that of an ideal Yamabuki Ogon. A Yamabuki Ogon is a yellow single colored metallic koi. Look for clean and consistent coloration without blemishes. It is a member of the Hikari Muji class. Other varieties in Hikari Muji class are PLATINUM OGON (white), ORENJI OGON (orange), KIN MATSUBA (orange with reticulation on scales).