From the World of John Wick: Ballerina | Theatres List

We first see her in John Wick: Chapter 3 – Parabellum gracefully pirouetting on a stage in the background. In this scene, John Wick has come to speak with "The Director" (Anjelica Huston), the stolid head of the Ruska Roma, the powerful crime organization that operates under the cover of a ballet company and from which Wick himself has retired.

What we don't learn then is the identity of the ballerina. Or how, moments later, she likely stepped off the stage, traded her tutu for a jiu-jitsu gi, and threw down a man twice her size in the theatre's back halls, where she trains as....