Manzat
A kingdom that has recently been reinvented under the classifications of colorful blood. This "New Era" encourages taking a name related to the color to which your blood has been previously assigned, but as many people are born into a world in which they can only see grey, only certain people who weren't born into color may get this opportunity. This new system is meant to keep order while the monarchy experiments on this phenomenon and figure out what happened to their ancestors merely 5 generations ago.
Dark fantasy?
When someone embraces the color in which they have been sorted into, they are granted a special ability. Each color follows along the same lines:
Red: Fire
Orange: Artwork
Yellow: Light
Green: Nature
Blue: Weather
Purple: Music
White: Fortune
Black: ???
Each color also tends to focus on one specialty/hobby that they contribute to the court as. Most are related to their magical abilities.
Red: Warmth
Orange: Art
Yellow: Entertainment
Green: Nature
Blue: Invention
Purple: Music
White: Religion
Black: ???