>>19632028The joke first started due to Fauna and Mumei not collabing, like iname, so they're iname. Kromei is the popular ship /here/ and outside, so that's gurame. Kiara and Ame flirt a lot and are just lovely with each other, so following the joke, Mubae works as Kiarame.
Of course, it doesn't all have to make sense, but it does follow it's own internal logic.