Finally watched all of it, cant help but think I was one of the people you thought of on Keka being over shadowed by KekeSumire. Also yes, you would be basic, if didnt have YohaRuby as OTP, which is also my fav sunshine ship, which apparently has more stuff in the sunshine manga. On the topic of being basic would KotoHonoUmi count as basic on the basic Muse ships, I wonder. Also I agree on you're Lanzhu/Kasumi dynamic Also, you'd probably have more thoughts on the rarers ships if you looked at side materials, pretty sure most of those pairing dynamics are explored there. Like first Niji manga had some fun stuff, like Ayumu being a utter chaos gremlin.
