I wonder what they have against Nacchu, she has the least screen time, little to none solo vocals, yes, she's the least popular, but didn't it come to their minds, that this may just be their own fault? Not show her: they don't see, they don't know!
I wonder if she really is bad, clumsy, not talented to play instruments or whatever (wonder, since I've never seen it, again, THEY DON'T SHOW), but maybe they should use it as her "Moe character"? She IS the moe type, show it up!!
(I know I have a tendency to like the side characters, in anime as well, Angel Beats, is my favorite Yuri? Kanade? I like those two, but can't be compared to Yui and the least seen of all Yusa. CLANNAD: Nagisa? Kyou? No, Ryou, who doesn't have her own real route!)