To be fair, Spider-Verse also counts.
If you describe something as Aquamanverse, most comic fans will know what it means.
Come to think of it, Dan Slott might do really well here among 21st Century writers.
Superior X: A superhero either becomes a jerk, or switches bodies with a villain for an extended period of time.
X-Island: Everyone in a location gets the powers of a hero. It could work for Green Lantern, Flash, etc.