Jim Shooter shares some insights as to ROM The Spaceknight's creation over at his blog.
Shooter, Marvel Comics then EIC, mentions meeting with Parker Bros. and ROM creator, Bill McCoy, creating the story and getting the creators onboard including Bill Mantlo, Steve Ditko, Sal Buscema and Frank Miller (ROM #1 Cover artist) and more.
Shooter had the following to say on the comic:
"I created the basic premise for the comic book series—the fundamental backstory (beyond what Bing and Parker Brothers had graven in stone). Bill Mantlo and whoever the editor was fleshed it out. For instance, Brandy Clark was definitely Bill’s creation, or at least he named her. On the other hand, Clairton (a small town in the Pittsburgh area, near where I grew up, transplanted for story purposes to West Virginia) and Galador are names I provided."
Head on over to the blog of Jim Shooter for the full article.