The characters in Errant are colour coded to the extent that they practically dress like unmorphed Power Rangers 
Rekki always wears warm colours, particularly red and orange, and usually accessories in warm browns. Any metal accessories on her person tend to be brass.
Subo wears earthy, natural colours and green, any accessories are copper.
Sarin wears various shades of blue with stark black and white. She might wear brass or silver.
Jules wears black and various shades of purple and pink with silver.
Rocket wears the trans flag
. This was not the original intention, I think, like with pokemon, there's just something about pink, blue and white that communicates "fairy".
In the prologue, Urien wore a fairly neutral outfit of grey, black and blue, but after becoming a tyrant king, he wears a lot of white and gold.
I track all the character's skin, hair and outfit colour palettes in any given chapter with a reference file so I can quickly find them, because it's easier than jumping back to previous pages all the time to sample.