Aside from Axl, Chris, and Izzy, Johnny was their only consistent member. They had a few different bass players; Andre Toxx, Rick Mars, Steve Darrow, and a guy named Snake that filled in a gig.
At one point they were a four-piece band with Izzy and Chris swapping the bass between each other in the studio. This is the way they recorded the 9 demos in January 1984, 5 of these demos have been officially released.

When opening for Stryper at the Music Machine in May 1984, Chris accidentally hit Axl with the headstock of his guitar, they got into an argument and Hollywood Rose disbanded.
A month later, Axl brought in Slash to the group to pick up the guitar duties. When Slash joined he brought with him Steven Adler and a complete lineup change was made.

(1983) - AXL
Axl Rose - Lead vocals
Izzy Stradlin - Guitar
Chris Weber - Guitar
unknown if they had a drummer or bassist at this point.

(1984) - Rose
Axl Rose - Lead vocals
Izzy Stradlin - Guitar
Chris Weber - Guitar
Johnny Kreis - Drums
Various bass players including Rick Mars, Andre Toxx, DJ, and Snake.

(Circa April 1984) - Hollywood Rose
Axl Rose - Lead vocals
Izzy Stradlin - Guitar
Chris Weber - Guitar
Johnny Kreis - Drums
Various bass players including Rick Mars, Andre Toxx, DJ, and Snake.

(June 1984) - The New Hollywood Rose
Axl Rose - Vocals
Slash - Guitar
Steven Adler - Drums
Steve Darrow - Bass
Izzy Stradlin - Guitar (tension between bandmembers cause Izzy to leave and join London a week later)


When this lineup broke up Slash would audition for Poison and play in Black Sheep while Axl sang in L.A. Guns before forming Guns N' Roses with Izzy Stradlin, Tracii Guns, Ole Beich, and Rob Gardner.