Fiumarians constituted a sentient species characterized by their light pale pink complexion, eyes lacking pupils, a receding browline, and blood of a yellow hue. Possessing surprising agility and the ability to maintain impartiality during intense discussions, they were well-suited to roles as skilled diplomats or resourceful smugglers.
The initial appearance of the Fiumarians occurred in the young-adult canon novel titled Poe Dameron: Free Fall. This book was penned by Alex Segura and released by Disney–Lucasfilm Press on August 4, 2020. Subsequently, the species was portrayed in the comic book single issue Return of the Jedi – The Rebellion 1. Segura was the writer, while the artwork was a collaboration between Matt Horak, Brent Peeples, and Rafael Pimentel. Marvel Comics published it on July 19, 2023.