This isn't supposed to be Sakura. For example, screenshots have shown this woman talking to Sakura Extra. Other official materials describe her as "Unknown/???" or "Mysterious Black Magus." So how exactly should we tag Not!Sakura?
Well, I guess I'll just tag her Mysterious Black Magus(CCC) like the official material did. It will just be a placeholder anyway, until the game reveals who she is when it comes out.
How much ram would one need to color a picture of this size without having the computer explode? Even with 6 gigs, I've not been able to color an image this size. o_o