@twinklecake i think the author just wants to keep it a bit unclear, the author is a fan of giving as little information as needed and i think it's a unique strong point of the series a lot of the time, but he does overdo it sometimes,
the author will probably just show even more unique and identifying character traits rather than physical ones to show the differences and shifts in his mentality from now on. mc is a total weirdo after all,
and aren't psychopaths the scariest cause they appear to be outwardly normal in almost every sense?
but after finding out their madness, it just makes them seem like monsters hidden under a thin human skin.
little breaks of the fake character are what then serves to remind us that they're not to be trusted
though i get preferring the aesthetics of the visual approach