Secret

Secret is a mysterious teenage girl made of living smoke or mist who became a member of Young Justice. Trapped between life and death, she possesses an eerie ghostly existence and allied herself with Robin, Superboy, and Impulse during their early superhero adventures.

A haunting and memorable presence from DC's late-'90s Young Justice era, Secret debuted in 1999 courtesy of the creative team of Peter David and Todd Nauck — and she's been lingering in readers' imaginations ever since. She shares her pages with some of the most beloved young heroes in the DC Universe: Robin, Wonder Girl, Bart Allen, and Tim Drake among them, placing her squarely at the heart of that generation's superhero scene. With appearances stretching across more than two decades into 2023, she's proven to have real staying power for a character who first materialized in the pages of Young Justice. If you're exploring the rich, character-driven corner of DC's Modern Age, Secret is exactly the kind of figure worth tracking down.