This is Illya from Fate series. This figure was apparently crafted in name of Fate Hollow Ataraxia but since Illya is a canon character from the beginning, I will brand as such.
I actually had some difficulty locating a non-sexualized figure for her and found it downright disgraceful that there were plenty of swimsuit version of her figure. Granted, her age was never revealed in Fate stay night and Hollow Ataraxia but her physical as well as mental age is that of a pre-teen girl.
After searching on google for about an hour, it looks to me that only Kotobukiya has produced canon Illya of 1/8 scale. And so, here she is. I obtained her at 20 USD, brand new, but it's supposed to cost fair more.
The figure is high quality. She is sitting on Berserker's weapon, I believe. The figure is small for a 1/8 scale but her physical size is small to begin with.
There isn't much to pick on in terms of quality. Painting and shading is very good and sculpting is decent enough.