Asagi
These are a non-metallic Koi blue-grey in colour, with a deep orange or red colour along the sides and belly and in the fins.
The scales upon the back are edged in a darker grey or blueish giving a highlight to each individual scale. The light blue head should be clear and unblemished.
The Asagi is one of the oldest varieties of Nishikigoi and has provided the basis for many subsequent varieties. 


Bekko
Bekko are a non-metallic white, red or yellow Koi with black markings.
There are three types of Bekko; the Aka Bekko, the Shiro Bekko, and the Ki Bekko. The Bekko has a simple stepping stone pattern of black running down it’s back set against a red, white or yellow background.

Shiro bekko is a white Koi with black markings. 
Aka bekko is a red Koi with black markings (aka is red body colour). 
Ki bekko is a yellow Koi with black markings (rare variety).


Hi Utsuri
A black Koi with red markings.
 

Kawarimono 
Kawarimono accomodates all non-metallic Koi that do not fall into the above groups :
Karasugoi is a black Koi with white or orange belly. 
Hajiro is a black Koi with white tips to its tail and pectoral fins.
Hageshiro is a black Koi with white tips to its fins and white head and nose.
Kumonryu is a doitsu Koi which is black with white markings on its head, 
fins and body.
Aka matsuba is a red Koi with black centres to its scales, creating a pine cone effect.
Ki matsuba as above but yellow.
Shiro matsuba as above but white.
Goshiki are white, red, black, blue and dark blue, giving a purplish appearance.
Kigoi is a yellow Koi. 
Chagoi is a light brown/olive Koi.
Soragoi is a blue-grey Koi.
Midorigoi is a green Koi. 
Benigoi is a deep red Koi.
Shiro muji is a white Koi, aka muji is a red Koi.
Ochiba shigure is blue-grey with a brown pattern.


Ki Utsuri
A black Koi with yellow markings (rare variety).


Kohaku
A white Koi with red (hi) markings on its back. 
This has been considered the most common variety of Koi, and has been said that Koi keeping begins and ends with the Kohaku. Kohaku's red should be deep red with well defined edges (kiwa) where it meets the white, which should be a pure and bright white. 

A tancho kohaku is a white Koi with a red spot on its head. 
An inazuma kohaku has a continuous red marking from the head to the tail, but with variation (inazuma means 'lightning strike'). 

A nidan (two) kohaku has two red markings.
a sandan (three) kohaku has three red markings.
and a yondan (four) kohaku has four red markings.


Koromo 
Koromo literally means 'robed'. This describes the red pattern, outlined in a darker colour, which varies with the variety. These Koi were developed by interbreeding Kohaku and Asagi.

Aigoromo is a white Koi with red patterns with the edge of each red scale tinged with black or blue
Sumigoromo is a white Koi with a black-ish pattern, the edge of each black-ish scale tinged with red.
Budogoromo is a white Koi with Sumigoromo appearance. They have black overlaying the red giving a purple/maroon colour. The edge of the pattern can resemble a bunch of grapes.


Taisho Sanke
Known simply as Sanke or Sanshoku, is a 3 coloured Koi with red and black on a white background. 
In the early 1900's, this new variety of Koi was created by the addition of black markings to the basic Kohaku patterns of red and white. 

A maruten sanke has a separate red spot on the head with normal markings on the body. 
A tancho sanke has a red spot on the head and a white body with black markings.


Shiro Utsuri
A black Koi with white markings. 


Showa Sanshoku 
Known as Showa, this is a 3 coloured Koi with red and white markings on a black background or base. 
The Showa, created around the 1930’s, features white and red markings against a jet black base. The black is the basis for appreciation of this variety, forming a strong background against which the white and red markings interweave in interesting patterns. Showa that have comparatively more white than black are called Kindai (modern) Showa.

A hi showa is a predominantly red showa. 
A kindai showa has a predominantly white pattern. 
A tancho showa has a red spot on the head and a black body with white markings.


Shusui 
The Shusui is the same as the Asagi except it has German (or Doitsu) scales along dorsal and lateral lines only. They are blue-grey with dark blue scales along the dorsal and lateral lines and red on the sides and fins.


Tancho 
Tancho Kohaku, a Koi with a red spot on the top of its head, and no red on its body.  
Tancho Sanke, a white Koi with with a red spot on its head.
Tancho Showa, a Showa with a red spot on its head and no red on its body.


Utsurimono
These are a non-metallic Koi often confused with Bekko but are mostly black with white, red or yellow markings. 
Utsurimono literally translates as “reflections” or “reflecting ones”. This category is made up of three different colour varieties.
All three colour variations are accentuated by a black base which emerges from under the white, red, or yellow field to create a pattern that suggests the “reflection” of colour on a black background.