Frexvea Arbrex, or as she knows herself, Foxtail, is your classic orphan. Her boots and her locket are the only things that tie her to the folks who know her name.
Living in the forest for a majority of your life presumably affects how well you interact with other people.
In Foxtail's case, she's a nuisance and an arse.

Foxtail is the original "fox", and is in both MOD and Werifesteria. Foxtrot is the MOD version, though they both used to be named the same thing.