Yinshin

Yinshin is Luna adoptive sister , she’s younger than Luna , but taller than her .

So yinshin is also a prototype for another generation of soldier , just like Luna she got implemented a materia (magical crystal), but she truly uses it as an invocation materia.

Yes she does have scales , like a dragon , because it sounded fun . Which mean she as two form. One without scales , and the other with scales

She’s into history, she prefer to dress up practically rather than fashionable .