Callixido Ryss, a human individual, belonged to the Cloud-Riders organization. Possessing a highly competitive nature, Ryss frequently engaged Moda Maxa in racing contests during their raids. Tayshin Maxa, Moda's elder sibling, harbored a suspicion that Ryss's behaviors stemmed from a romantic interest in her. Ryss was armed with a tibanna-modified DH-17 blaster rifle and piloted a Javelin-112 swoop bike. His helmet was equipped with a sensor-band receiver dish.
The initial appearance of Callixido Ryss was in the 2018 motion picture Solo: A Star Wars Story. His identity was subsequently revealed in the reference publication Solo: A Star Wars Story The Official Guide, authored by Pablo Hidalgo. He was brought to life by the stunt performer Cali Nelle.