Taihei Doma

Taihei Doma serves as the male protagonist of 'Himouto! Umaru-chan,' balancing a career as a systems engineer at Diamond Service with the full-time role of caretaker for his notoriously lazy younger sister, Umaru. Despite her indulgent and carefree lifestyle at home, Taihei shoulders every household chore and living expense without complaint. While he occasionally reminds Umaru to keep her behavior in check, his deep affection for her is unmistakable—making him the quintessential dependable big brother who excels both professionally and domestically.