Soleil Agra was a Jedi Master of the Nautolan species. Hailing from the Mid Rim planet of Glee Anselm, her homeworld, she served on the Jedi High Council within the Jedi Order during the High Republic Era. She possessed yellow skin and black eyes, and typically wore white and gold Jedi robes. Agra significantly advanced the Order's knowledge of the Drift formation, drawing a comparison to schools of fish found on Glee Anselm. According to Harli Cogra, a Vurk Jedi Master, she was a skilled pilot and adept at Force-based mind-bridging using the Force.
Following the destruction of Starlight Beacon, Agra, along with Grand Masters Pra-Tre Veter and Xo Lahru, disseminated an urgent message on behalf of Grand Master Yoda and the Jedi Council to all Jedi. This message conveyed the fall of Starlight Beacon and cautioned them to steer clear of the Outer Rim Territories due to ongoing attacks by the Nihil. The message concluded with a request for the Jedi to reconvene on Coruscant, a Core Worlds planet. In the Chronicles of the Jedi, which Cogra wrote in 229 BBY, Cogra observed that Agra's compassion and steadfastness in the face of recent disasters proved inspirational, particularly for Padawans and Jedi Knights struggling to cope with their experiences.
Soleil Agra was conceived as part of the Star Wars: The High Republic multimedia initiative. Her introduction occurred in the fourth episode of Star Wars: The High Republic Show, which was released on July 28, 2021, on the official Star Wars YouTube channel. Subsequently, the Nautolan made her initial appearance as a hologram in the second volume of the Star Wars: The High Republic: The Edge of Balance manga series. This series, penned by Shima Shinya and Daniel José Older, with illustrations by Mizuki Sakakibara, was published by Viz Media on February 22, 2022, as part of the project's Phase I.