The PCP Guy is a mysterious man who serves as the mascot for the PCP. He is the physical embodiment of pro crastination, as evinced by his slacked-jawed, vacant expression.
He is presumably a character from a manga or comic, but his exact origin used to be unknown and was one of the greatest mysteries of the PCP.
After a long time behind the shadows, and after extensive searches by fans and PCP members alike, on February 25, 2017, StumbleReel located and posted the source of The Mascot on Twitter.
The illustration features the character Tōka Fushimi from Chapter 5, Page 11 of Inari, Konkon, Koi Iroha.