Could Galactus be considered a DC Comics villain, given the context of universe-hopping or multiversal events?

While Galactus is a Marvel Comics character, in some highly theoretical or crossover scenarios (like Amalgam Comics, which merged Marvel and DC characters), he could appear. However, in the standard DC Comics continuity, he does not exist. DC Comics has its own cosmic entities like the Anti-Monitor and the Spectre who fill similar roles of immense power and universal threat.