It's also just a mind that might be desperate for a core identity after having its last one logically dissolved through introspection.

While ego can hijack identity for it's own mad desires, an identity is required for the actuation of relational actions on a basic level. With no "center" from which to make decisions, the functions of your mind tasked with making choices will panic - this is a foundation of brainwashing/psychological manipulation. Very similar things happen to people who have a TBI, where they become stressed when forced to make choices that seem to have zero baring on "their" lives.

So dissolved identity > Panic attacks when choice-satisfaction plummets > subconscious suggests all kinds of cartoonist extremes for an easy and powerful identity > Conscious mind agrees to play along, uses this character to make decisions about > Choice-satisfaction rises.