Nobita's teacher, universally called "Sensei" (meaning teacher in Japanese), presents as a middle-aged man with a barrel-shaped physique, peach-toned skin, and a curtain-style black haircut cropped short at the sides and back. His rectangular glasses frame a button nose and prominent cheek wrinkles. He consistently dresses in a white shirt with a black necktie, brown blazer, and slacks, matching student Gian in height. As Nobita’s homeroom teacher, Sensei embodies strictness, responsibility, and righteousness. He routinely reprimands Nobita for chronic tardiness, unfinished homework, classroom napping, and failing grades, enforcing discipline through hallway standing or window-cleaning detentions. Beneath his stern exterior, he occasionally offers kind encouragement to spur Nobita’s academic improvement. He respects top performers like Hidetoshi Dekisugi and confronts bully Gian when warranted. Sensei also makes unannounced visits to Nobita’s home, updating his mother Tamako on academic setbacks or progress. In *Stand by Me Doraemon*, Sensei upholds these traits, scolding Nobita over failed exams with a tone of underlying concern. His visit to the Nobi household underscores his dedication to student accountability, balancing discipline with subtle care for Nobita’s future. Franchise-wide, Sensei remains unmarried, implied by his counterpart’s unmarried status in *Parallel Planet*. His name varies inconsistently: dubbed "Ganari" in Nippon TV anime and "Eiichirou Senjou" once in TV Asahi versions. Predominantly, he is addressed as "Sensei" across media, localized as "Mr. S" (English), "Sir" (Hindi), or "Signor Maestro" (Italian). Sensei’s background receives minimal exploration. He lives alone and is frequently depicted returning from work. His influence extends beyond school; he admonishes students in public spaces about pending homework. Nobita’s perception of him shifts dynamically among fear, respect, and admiration, dictated by context.