Nida qualifies as a SeeD along with Squall, Zell and Selphie. Add to that, he's the one who always pilots Balamb around, whilst Xu spends a lot of time up there...

Quistis totally deserves being mean to. Really. Her personality is hideously flawed, and being treated like crap would probably actualy be beneficial to her in the long run. Or at least, that's my excuse.

It's been suggested quite a bit that Fujin is an albino; white (well, more grey really) hair, red eye, pale skin. Add to that the link between her and Raijin's names; they're were both demons that opposed the Buddha, but were captured and basically became weather gods; Fujin as wind and Raijin as thunder. It certainly suggests a kinship between the two, and if the albinism is correct (though really, it is just a theory), then it's not hard to believe that they're brother and sister.