Sicarus was a Nihil Child of the Storm of the human male variety, serving under the command of Baron Boolan in the age of the High Republic Era.
George Mann penned Sicarus's appearance in The High Republic: Tears of the Nameless, a young adult novel released in 2024 as part of Phase III of the Star Wars: The High Republic multimedia initiative. Mann revealed in an interview that crafting Sicarus's character presented unique challenges.