Sonia was the first original female character I ever drew(about 8 years ago as Sophia). Her current design is a combination of 2 girls I met in school.
(my mom too, but I won't get into that).

Sonia is Russian, hails from the chukotkan region in Siberia, and speaks English with a slight accent. Her mother was an Yupik, who died after giving birth to her. She has 2 half brothers from a different mother living in Moscow. Their father is a scientist doing research in several subzero regions.

She's a lot less cuter/ditzier than she looks (especially in this deviation), which is to be expected, given her occupation (armed combat expert!!). Her small build holds more power than is thought possible, although her being an experimental mutant may have had something to do with it.

Yea, she doesn't really look like fox when she's calm... like in the picture

Agitate her enough though and her appearance changes radically as well as her size.

Rest form - human (sometimes with pointy ears)
LV1 - human/fox ears/tail
LV2 - anthro (her muscles also become more angular and pronounced)
LV3 - looks more like a wolf than a fox. Muscle mass and size increase exponentially. Loses any and all sense of self.