: A hyper-competitive, boisterous classmate who views "Outer Umaru" as her primary rival. Real-Life Inspiration and Legacy
The story centers on Umaru Doma, a high school girl who maintains two distinct identities: 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. : A hyper-competitive, boisterous classmate who views "Outer