>>11263556
>>11263972
Character is named Xanadu
Artist is Sasaki Tatsuya/Sasaki Maru
She was created in 2013 for Pixiv's annual Pixiv Fantasia collab, where artists on the site could create OCs for that year's fantasy world. This page here gives a quick rundown
https://www.pixiv.net/en/artworks/34200350