Nathalie

A young woman of 003's past, in being her friend but also a rival ballet dancer. When back in Paris, 003 sees a girl that resembles her, and initially mistakes her for Nathalie (who would be middle-aged or dead by now).

An illusion of Nathalie later appears to taunt 003, as part of Black Ghost's manipulations.

(Source: Cyborg 009 Wiki)