When it comes to gaia, I like using gold/orange, purple, gray and pink. I'd love to use more teal and true orange, but gaia doesn't have a lot to offer when it comes to those colors.
I think I usually end up having some sort of dull purple tone to my avatars, mostly because the drone skin from Death Whisper is one of my favorite skins ever and it matches everything. emotion_kirakira
And I know I don't seem like the type to like pink, but I absolutely love using pinks. Not really pale or peachy pinks, though. I prefer the tone that was used in Boto Encantado, or the pink hair from Rosamund's Revenge.
As for colors that I don't like... hahahaha. Cream.
I also don't particularly like blues.
I used to hate mint too, but oops I actually REALLY LOVE IT NOW