Shibui is a tall, slender male with short reddish-brown hair parted at the right slightly, and deep blue eyes. Like the other males at Mizukihana High, he wears a dark purple gakuran with brown shoes.
Shibui is a fairly laidback boy with a potty mouth despite his friendly demeanor. Despite this, he doesn't have much trouble making friends but used to be much more anti-social and shy as a child, which helped him with making friends with Mikomi , as both had very few to no friends during that time. Once he's made friends with someone he's very loyal and dedicated to them. He likes to joke about to make his friends feel happier and more comfortable and is a constant source of support for the people he cares about.
Shibui is not actually a first name, and was a mistake by his creator.
According to Shibui himself, it was because his parents were somewhat tipsy when deciding his name, and became too fond of it to change it afterwards.
Shibui lived in Niigata before transferring at the start of his elementary school years.