What comes with a paper cup, is probably lukewarm and a bit bitter, and contains massive amounts of caffeine? Me! But also this Bodega Coffee! To be clear, the coffee is actually in a paper cup, unlike me. I just carry a paper cup around everywhere for some reason.
Imagine an infinite number of alternate dimensions, sliced thin like salami and all layered together in a delicious sandwich of universes. In these parallel strata of time and space, the Squishables are very, very different. Squishable Alter Egos are all the Squishables that might have been (and almost certainly still are...somewhere).