As mentioned elsewhere the Big Two comic book companies have a stable of characters culled from decades of trial and error with proven staying power but sometimes they want to launch a new character for various reasons. New characters tend to fail due to a combination of Sturgeon's Law and fandom's attachment to the existing vetted characters. Legacy Characters do inject fresh blood into a title sometimes but they only revitalize the existing franchises rather than creating new ones. The solution is the Legacy Launch. It works something like this.