In her costume from The King of Fighters '99: Millennium Battle, it's Athena Asamiya! There's a lot of good Athena costumes across the series, but while my favourite is probably the 2002 / NeoWave one, I'm a big fan of this '99 one where she cut her hair short and went for this seifuku / crop top / hot pants combo. Nice boots, too. This is also the look that showed up in SNK Gals' Fighters, leading to an amusing ending where she wishes for her long hair back then has to cut it again. Oh well.
