Brother Gustav was a seven-foot Martian who was part of Faction Paradox in the era following the Eleven-Day Empire's demise.

Gustav grew up with many siblings in a nest in one of his people's hives. When thinking of his early life, he would remember swords, rituals, and "clans gathering in an ocean of green armour". Gustav joined the Faction after Mars was caught in the War in Heaven and put in a state of constant flux by the time war between Cousin Eliza and Sutekh, the enemy's overwriting narrative, and Great House experiments. He hoped to ensure his people's history survived by the Faction's ways. (PROSE: Going Once, Going Twice)

Gustav lived at Auteur's Shadow Spire, becoming like a brother to Intrepid and Kifah. On one occasion when the three were sharing a fire outside the Spire, they witnessed Life's angels announcing the Armistice. (PROSE: Hark! The Herald Angels Sing)

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