The Australian actress, who is starring in The Meg alongside Jason Statham, appeared on The Tonight Show With Jimmy Fallon on Wednesday.
As a young, gay person, she never felt represented on TV, she said.
She shared: "I kept spontaneously crying and I kind of feel like I'm going to do it now, so I'm just going to". The second one-sheet places over Batwoman's face a comic-accurate mask that gives her glowing yellow-orange eyes.
A standalone Batwoman TV show is also now in development at the CW, though a premiere date has not been set.
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Per the logline, as quoted by the magazine: 'Armed with a passion for social justice and a flair for speaking her mind, Kate Kane soars onto the streets of Gotham as Batwoman, an out lesbian and highly trained street fighter primed to snuff out the failing city's criminal resurgence'. The Batwoman that will lead her own series will be openly gay, and The CW was determined to cast an openly gay actress for the role. "Thank you everyone. Thank you god".
She has dated women and is open about her gender fluidity.
The star wrote and produced a 5 minute video set to Butterfly Boucher's "It Pulls Me Under", where Rose transitions from female-presenting to male-presenting. Rose even revealed two real-life connections to Batwoman: her mother kept bats inside the house - "she nursed these little pet bats back to life, but then they couldn't go anywhere because they were domesticated" - and Rose used to make batwings out of cardboard boxes and pretend to fly around the house.
For those who are yet to encounter the hero in any setting, you're in an enviable position. Rose, some claimed, was the "obvious choice", with others saying they haven't been convinced by her acting abilities.