His shows a high IQ. It's reflected on his subconscious. He seems like he isn't aware of his sourroundings but deep inside he has figured out some insights. And as a way of protecting himself he developed that figure. Eventhough i'm not sure if it can be taken as a different personality.. It breaks me seeing stuff like this in real life.
Maybe, the so called rare species is our cute "bodacious booty" that let his wild and above-all pheromones when he is truly aroused(? idk. Just my guess. And he is unconsciously in love with the "big dog" lol
this theory kind of makes sense