User blog comment:B214/Question and Answers 6/@comment-9595671-20160820194143/@comment-26821288-20160820231610

First of all, Ryuu means Dragon, I'm sure of that.

I'm pretty sure it goes like this:

Seki = Red, Ryuu = Dragon, Tei = Emperor

Haku = White, Ryuu = Dragon, Kou = Emperor