*Spoilers that have already been stated, so not really*



Quina is not female, as it cannot equip Lamia's Tiara, Extension, etc. But it CAN equip male stuff, I believe. Who knows, maybe the Qu clan doesn't even have male and female. They probably reproduce some other way, but I don't think it would be asexually. I have deduced it to be a male through the equipment stuff, and that since no one can really tell what Quina is, then they just give it the benefit of the doubt in marrying Vivi. They say s/he a lot, but they always say "him", so that's either a clue or neglect on Square's part.

"I so happy..." - What an... odd line.