In the illustrations for A Space Godzilla, Rozan generally resembles Godzilla designs from the Showa era, notably the MosuGoji, DaisensoGoji and ShodaiGoji. A puppet was created for the Space Godzillas for the unmade film based on the short story, but it is unknown if the puppet was created to portray Rozan or one of the other Space Godzillas.
Rozan is a Space Godzilla, a member of a species of intelligent aliens that hail from Godzilla Planet. After conceiving a child with her husband Kunin, Rozan arrived on Earth at some point, where the humans saw her only as a destructive monster. At an unspecified point before the start of A Space Godzilla, she contracted Diabetes and by the time of the book's opening was close to death.
One day, Rozan floated ashore in Japan, seemingly dying. Scientists quickly dissected her, only to discover she was dying of diabetes and was actually an intelligent alien. Using psychic communication, Rozan informs the scientists that she is carrying an unborn child and must return to her home on Godzilla Planet. The scientists convert Rozan into a rocket ship and launch her into space with her unborn son, Lilin, sending her on her way to Godzilla Planet.