Comic book companies often hype up major comic events as status quo changing to get readers invested. What they often don't discuss is how often new heroes debut in their pages. Major crossovers or big event storylines like Crisis on Infinite Earths or 52 were great launch pad for new characters, because so many readers are checking it out for their existing favorites.
Source：https://www.cbr.com/dc-comics-superheroes-important-events-first-appearances/
