I'd like to side with Jambo.

In the quantum world, if we allow our everyday definitions to be suspended a moment, it is possible to conceive of all possibilities as being materially fulfilled somewhere and sometimes, but to be available without precise ordering nor other locating qualities, other than the necessities that the complex must not preceed the simple, and the traits of the present must be available to be created or spontaneously somehow from the past. This gives a huge set of all possible parallel universes, arranged in every possible order, and with every possible variation.

The inner "self" is associated with a point of view, a perspective that travels through a sequence of experiences. Popping into a non-ordered space, we are at leave to associate our natures with whatever the available set of  traits might be that best fits our nature, and to continue making sequential associations forward in time as we move to the next event, based on where we are at the moment, what our viewpoint peceives, and what we choose.

This is like walking through a city by selecting sidewalks and buildings that were previously made, and thus selecting a sequence of events that typify your passage through that city. Parallel realities are represented by all the other pathways along other sidewalks, but ones you did not choose.

This type of model is called a "dual aspect theory", and was initially championed in psychology by William James. The val;ue is that it allows us to view our "self" as of a different nature than "extended reality", and yet also to view our "self" as the product of interactions with reality.

In a dual aspect sense, the "self" manifests as a pattern of information that flows along logically probable lines, just as the sidewalks over which it travels follow logical lines. The reason that the two stay together is that the same logic applies in both cases. Thus, it's kinda like the right hand being different from the left, yet they are actually one and the same if you allow the existence of shoulders and a neck.

dave