DC

DC is where everything takes place. Even in Chima, Ninjago, The Legacy, and Penetrators, the omniverse always remains called DC.

The character protagonists' original home universe was created by Maxis (as were all the others), who was created by Nugget, in the real world. Nugget was possibly the most important meteor of them all, for creating every single location (by making Maxis), and every single side character. Some side characters, however, actually earned the status of main through continuous effort in the sagas. Examples of Important Side Chars are: Emman, Thunder, Midnight, Charon.

It should also be noted Nugget is the true master of the mindspace, which is basically the physical representation of creation itself. Nugget also mysteriously doesn't die of age once Penetrators starts in the far, far future. Nugget could possibly be extra terrestial, if not an abnormal entity.