How about "mettlesome" -- "full of spirit and courage"? I sure like that one.
"Spirited" is good too, IMO -- it gets at Gamine's energy.
How about "spanking" as an adjective? Perhaps a bit silly, but so, so funny. It makes me laugh and smile, which is actually the effect a Gamine look will often have on the viewer. Gamine's witty, quirky style brings a smile.
Gamine is definitely edgy -- not in an intimidating way, as Dramatic is, but in a playful way.
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