i wouldn't say my comics operate within a complex multiverse, per se, but at present most of my in-development characters whose stories are still being worked on exist within the "hub world" of my current main series Foxtales and Gekkering.
The rough concept being that certain aspects of their personalities would be discovered or worked out there before they move on to their correct universes. Of course once they "pass on" from the "hub world" no memory of the place would exist. Kind of like a long dream before waking up to their true reality.
The only stories that actually have a shared universe or coexisting multiverse would be three in development stories i have, in which there's the fantasy universe and the modern universe that the characters exist in. they exist in both but the main difference is how they change based on setting (basically alternate universes)