"Rosy Cheeks Boy doesn't know why he was abducted and thrown into a research testing facility. Perhaps it was because the Panic Bots confused him for a dragon of legend. Regardless, he had to navigate the perils of the lab in order to regain his freedom!" ― Rosy Cheeks Boy's Trophy Description.
Rosy Cheeks Boy is a pink cube, similar to Cuboy, with a tuft of hair, white gloves and purple shoes. His eyes are placed close together and he has noticeable pink cheeks.
As part of Yolk
Main article: Yolk
Rosy Cheeks Boy also appears as a part of the "Buddy Toss," Yolk's up special. The character is cycled through, and is the fourth character out of six to be summoned. When thrown he deals 5 damage.