What fun 8D
I'll try my hand at a few of mine!
My character Feni'tat would most definitely be a cheery, bright as you can get, yellow!
Jinai would be purple- since the feelings behind purple were best described by my art teacher Mr. Pionti (in college) as 'a pregnant woman' since it is a color mixed of both warm and cools, so you get both sides of emotions in one fun color :D
The Grand Duke of Connlaoth- Calent Allarrick- is definitely some sort of Slate Blue, to depict his coldness and withdraw from most emotions.
Kentamin Dhelsbar would probably be Red, as he's quick to anger, and quick to a lot of emotions and actions.
One of my latest characters, Danning, would be white, for his virtue.
And Candy, my crime fighting whore for JUSTICE- would totally be Hot Pink, a bold statement of a color, just like she tries to be.