He's is Emiri's coworker in the plush doll department.
Iwahsima is created by Chihiro Harumi, and he has no information regarding any inspiration used to create him. Ryou first appears in chapter 2 of Koi o Suru no ga Shigoto Desu volume 1.
Unlike his co-workers at BNB, he wears a sweater vest. He has a beard.
At first, Ryou thinks he's cold, but he realizes that Iwahsima has a soft side for plushies.