There are three types of Bekko Koi: Aka (red), Shiro (white) and Ki (yellow) Bekko.
I had a lovely bunch of fantails when I was a teen. My favorite one was Special Patrol Group. (link PG-13)
The Kohaku remains one of the most popular breeds of Koi in Japan. The bright red markings are known as hi. The Kohaku has a white (shiro) body, with red (aka) markings, or ‘hi’, across the body.