Asia Kate Dillon wandered into a coffee shop near Brooklyn’s Prospect Park looking like a fallen angel taking a personal day: Black shirt, black jeans, black sneakers, black liner circling each eye. Dillon, who gave eye-catching performances as Lucifer off-off-Broadway and as a white supremacist on “Orange Is the New Black,” broke out as Taylor Mason, a nonbinary hedge fund wunderkind on the Showtime series “Billions.”

“Hello, I’m Taylor,” the character says when first meeting the fund’s boss, Bobby Axelrod (Damian Lewis). “My pronouns are they, theirs and them.”

Dillon, 34, identifies as nonbinary, too, with the same preferred pronouns, a gender identity the “Billions” role helped them clarify. And Dillon has recently taken on a new role. In “John Wick: Chapter 3 — Parabellum,” currently in theaters, the actor plays The Adjudicator — basically the head of international assassin HR — enhancing the action franchise with a nonviolent, nonbinary, high-glamour authority figure.

On a recent afternoon, Dillon ordered a half-mug of coffee , also black, and reclined barefoot in the pillow-dotted loft above the shop. With warmth and openness and far more hand gestures than you’ll see from the actor’s taciturn characters, Dillon discussed soft power, killer costumes and how to show skin and emotion on camera. These are excerpts from the conversation.