Kawarimono

Kawarimono are koi that are not benched into any of the other varieties or classes. They are mostly non-metallic varieties with the exception of Kumonryu and Kikokuryu. 

Karausugoi, Kigoi, Akame Kigoi, Chagoi, Soragoi, Midorigoi, Benigoi, Ochiba Shigure, Aka Matsuba, Kumonryu, Beni Kumonryu, Kikokuryu, Beni Kikokuryu, and Matsukawabake.