Fleur Bolan, a.k.a: Eve Bolan.

Full name: Fleur von Eiterzental Bolan; Fleur von Eiterzental Mariel Bolana.

Also: that fox, that vixen in Holo's words.

Eve is a traveling merchant stationed in the port town of Lenos by the time Lawrence meets her. She's originally from the Kingdom Of Winfield, however, due to events in her past, she was forced to leave and start a new life as a merchant. As a merchant, she's extremely skilled and keen-eyed towards either profit or people. Hard to approach, few actually knows that she's a woman. This is due to the fact that, for convenience, she wears heavy layers of cloth (usual to northern merchants) but also a long scarf that covers almost her entire face. When she's not wearing this outfit, she's known for extreme beauty and perfectly portrait a naive town lass.

In the novels (volumes 8 and 9):

(Source: ASCII originals, YenPress translated novels, Wikipedia)