Yes, for quests, they request certain colors be involved. I don't understand yet why it's like that though. My guess would be... this.

[ Wide gesture to the colorless parts of their environment, which is a lot. If only these two non-humans understood painting and color theory. He gets the suspicion though, and while Honebami isn't sure if it's right to deny it because he's curious and skeptical as well, he can at least provide thoughts. ]

I would be, actually. But I don't think I do anything harmful or suspicious. [ A pause. ] Was your home like that?

[ ((i don't mind hnk spoilers btw!))
...Phos is peculiar-looking but also poses a good point, so what is their world like? ]