The Baron of Trilermeriaq was a posthuman resembling "vibrant yellow coral" with "swaying sacks of brain". He had a lover who had the same general body shape as him, although they seemed to present as more feminine, somehow cramming themselves into a satin evening gown whereas the Baron managed to wear a three-piece suit.
The Baron and his lover were among the guests at the First Auction in Heaven. He successfully bid on the Ochenissi Tablet. When Cortalian announced that the Tablet was his, the Baron squealed excitedly and mind-melded with his lover. Like the other guests at the Auction, they presumably ceased to exist alongside the rest of the planet Kratoam in the aftermath of Apep's rebirth and destruction. (PROSE: Going Once, Going Twice)