Rix is a character in the On the Way to a Smile novella "Episode: Denzel".
More than a year after Midgar is destroyed, the survivors living in the rubble slowly leave to go to Edge, and only Rix and Denzel remain living in Midgar. When the two realize that they are out of money and cannot afford to trade supplies for food with the Edge residents anymore, Rix suggests they move to Edge for free food. Denzel replies that they will catch and eat rats "like real slum kids"; Rix tells Denzel that he used to live in the Slums, and the rats are inedible due to the pollution from the plate where Denzel lived. Rix leaves for Edge afterward.
Denzel tells Reeve Tuesti that Rix is still alive and living in Edge shortly after recounting this part of his story, but claims the two of them have not spoken to each other in some time.
Rick is a shortened form of Richard, roughly meaning "powerful leader". Zack's Japanese name is similar to Rix's, being pronounced "Zax".