Quote Originally Posted by Masamune∙1600
As evidenced by Quina's presence during the ending, Quina obviously does not die.

As to the matter of Quina's gender, it's certainly a topic for debate. It's obvious, though, given the fact that Quina can equip the female-only Lamia's Tiara, but is not Covered by Protect Girls, that the question is meant to be ambiguous.