Ashe and Leblanc of French Basis
IMO Leblanc is the most French character in the entire FF series. She's a fashionist (from the way she dresses), has flirtatious tendencies (her line "Let me blow you a kiss" and calls anyone "Love") and lives in Seymour's manor in Guadosalam which she now calls Chateau Leblanc. "Chateau" is French for "Castle." Moreover Leblanc's name translates to "The White" in French. Leblanc is also a factual French surname.
Ashe in turn was purposely designed to be vaguely French. According to Akihiko Yoshida, FFXII's designer, "The base of Ashe's bone structure is that of a French person's. We were given orders from the start to not make her look like an Asian. But we modified her a bit to look more like a Japanese for the sake of the Japanese audience, and also since a character that looks completely French makes some of the CG expressions difficult."