Hm...well, seing as Amuro Ray and Loran Cehack were also known as the white devil, this isn't such a stretch.

Wait, is that Vita?

Could be Vita. Or it could be Quattro from StrikerS.

Oh, and I do dearly hope it's Quattro.

It's likely Vita. Nanoha is labelled as "Nantoka", what Vita called her in A's.