This is probably a stupid question, but I'm just curious.
Throughout the Kirby series, we've seen these on Waddle Dees, Waddle Doos, Bronto Burts, Sword Knights, Blade Knights, etc.
At first, I thought that they were for highlighting a specific enemy with a different attack pattern, but I've noticed that some enemies behave exactly the same with or without these alternate palettes, which makes me wonder what their exact purpose is. Did Hal just put them there for the setting of the level you're in, or just for show?
Anyway, it's not like I'm complaining about them. Like I said above, I'm just curious.