Purson Soi is a freshman student at Babirus Demon School attending the Abnormal Class alongside Suzuki Iruma.

Soi, at a glance and when mostly seen, is quiet and doesn't really talk to any of his classmates. His mouth is never seen to open, with their eyes expresses a blank state and his face had always looked bland and gloomy as if he's always bored. He often tends to turn his head to one side or the other when appears.

In truth however, Soi is a very sophisticated person and has a lot of knowledge of words. Although his father forbids him to do anything with him standing out, he still has his way with words, though mostly to himself; outspoken or in mind. As someone who had never got any conversation with anyone beside from his family, as mentioned, he often talks to himself, or if ever finds himself being able to talk comfortably with someone, he will yap endlessly.