Nobita’s homeroom teacher. He is a strict taskmaster who often punishes Nobita for failing to do his homework. The punishments range from standing in the hallway to sweeping the classroom after-school. He often pays unexpected visits to the Nobi’s in order to inform Mrs. Tamako about Nobita’s recent zeroes on exams. His real name is unknown and he is only referred to as “Sensei”, but in the NTV anime his name is given as Ganari.