Pleasantly surprised no came under the assumption that 'Colour' is misspelled yet.
Anyway my favorite colours (achromatic or otherwise) would have to be black, grey, A bit of white when in contrast to black or grey. And finally to a lesser degree red and even green on occasion when used together with black.
I used to like red and blue, primary colors. Now I like purple and orange, secondary colors. That probably says something about my psyche, but I don't know what.