Yosshii, also called Yoshi, is a high school student and a member of a tight-knit friend group. This character has light hair often styled in twin tails, a distinctive ahoge, and brown eyes. A snaggletooth frequently shows in their smile, and their look is typically finished with socks and earrings.

Their personality is generally airheaded; they most often follow another friend's lead, echoing their statements and getting embroiled in their schemes. The character regularly participates in teasing a particular upperclassman, though these antics are not meant kindly.

As the story develops, the group's dynamic changes. They come to realize a mutual crush exists between their friend and the upperclassman, prompting them to become supportive and actively conspire to unite the pair. The character is also noted to be an athlete.