Mr. Gotō, formally addressed as Gotō-sensei, teaches at Samejima Academy where he oversees student guidance and discipline. His daily routine includes monitoring students at the school gates each morning, often holding a bamboo sword as a symbol of authority. Despite his stern exterior and strict enforcement of rules, he genuinely cares for his students' welfare and finds deep satisfaction in his teaching role.

As the advisor for the school's disciplinary committee, he prioritizes maintaining order. Recognizing Momo Shinozuka's earnest nature and her previous isolation, he invited her to join the committee. He values her as a reliable partner in upholding school standards but remains entirely unaware of her romantic feelings towards him.

Outside his professional duties, Gotō harbors a private passion as an idol fan, a hobby that occasionally surfaces and contrasts with his disciplined school persona. This concealed interest adds dimension to his serious demeanor. His interactions sometimes involve responding to, or being flustered by, the unconventional behavior of students like Chio Miyamo, though he consistently addresses such situations as an educator focused on guidance.

His surname, Gotō (後藤), combines the characters for "rear" or "remainder" and "wisteria". No given name is documented. He is the only character to appear in every episode from the first onward throughout the series.