"I don't think I have one. Of course, my color vision isn't that great." Not to the point of being colorblind or anything, just... not so good. There's a reason he prefers to work in black and white when it comes to his sketches.

Now if he asked for his favorite Pokemon type... well, he loves them all equally too, but he seems to have an affinity for Poison types. And they don't have a lot of other people that love them, so....