Note: I state many times I can be horrible at armors etc but in this case, its designed by me so it's not hard. This is armor Sapphirus would have on in a Kingdom Hearts Setting. Also, the colorful/assorted gemstones represents her elemental powers, nothing more.

Kingdom Hearts Fever ftw!!!
Sapphirus in general is a character of good and not evil, in this pic, she's is dressed in crystal armor with a keyblade fused from her two tails into one blade, reason why her tails are absent. In the tails form she has no control over them because they each got their own will/intellect. Right tail is the Strategist/Clever one that plans and finds the weakness of someone and the left is the Overly protective/aggressive one which will attack anyone close to Sapphirus. In Keyblade form she has full control over it.

She's in a realm that darkness is an issue and of course, she's a Keyblade master, and summons the power of light to vanquish the heartless, they seem to really want her weapon. Keyblade is named the Sapphirion, it's overpowered and has unlimited energy, like Sapphirus. KEKEKEKE! >=D
Also, her wings are a bit smaller in the armored form.