I actually drew this because I thought it'd be fun to draw Kamei Eri in the One Two Three outfit, but then I thought about Haruka having the same member colour. I also wanted to try drawing facial features the right way to make someone recognizable.
I think if Eri was still in Morning Musume, Kuduu would still have orange as her colour. I imagine that it would be kind of like the other darker/lighter member colours.
I think I want to do more of these with MM members.