These are the last three emotions that can be shown by the color change of Chrysanthos’s eyes. I already showed what purple meant, so there was no need to put it here.

Yellow: This means he’s embarrassed and/or surprised. His eyes can also change to this color when he’s been caught doing something he shouldn’t (which really doesn’t help whenever he’s trying to come up with an excuse for his actions.)
Light Brown: Whenever his eyes change to this color, it means he’s sick. His fur and his mane can also become a paler color, depending on how sick he is.
Mixed Colors: His eyes can become two (or more) different colors at the same time. How many colors shown depends on how many emotions he is feeling at once. (Like how, in the pic, his eyes are yellow and red.)