Anyone know who this character is?

[XxPop-chanXx]

Anyone know her name or what series she's from?

[Mugetsu Ookamiza]

it's from Pixiv Fantasia: Fallen Kings. that's a Pixiv original art project organized by one of the members.
the full version of that image is here: http://www.pixiv.net/member_illust.php?mode=medium&illust_id=42393377