: In public, Umaru is a "Mary Sue" archetype—a beautiful, intelligent, and talented student admired by everyone.
: A classmate with a fierce appearance but a shy heart who accidentally discovers Umaru’s "inner" form, leading to a unique friendship. Himouto! Umaruchan
: Umaru’s hard-working older brother who manages their household. He acts as the grounded foil to Umaru's eccentricities, often tasked with cleaning up after her and encouraging her to be more responsible. : In public, Umaru is a "Mary Sue"
The story centers on Umaru Doma, a high school girl who maintains two distinct identities: : In public