Principal Teraodai leads Robot Academy in the 22nd century, having invented the cat robot models and playing a central role in their education and deployment. His lineage traces back to Hiroshi Teraodai, the 20th-century principal of Public Tsukimidai Elementary School, marking a family tradition in education.

He possesses grey hair and a moustache, dressing in modern attire. His personality blends mischievous and crafty traits, often expressed through teasing behavior, and he is a heavy smoker. As a leader, he combines stern authority with underlying compassion, especially for underperforming students.

He demonstrates keen perception regarding Doraemon's manufacturing defects, accurately identifying an electrical strike and blunt force trauma as the causes. Despite these challenges, he transfers Doraemon to a specialized class for unique robots instead of discarding him, reflecting his belief in tailored education. His dark humor surfaces in repeated jokes about sending defective robots to the incinerator, which deeply unsettles Doraemon due to nearly facing furnace disposal during creation.

His relationship with Doraemon remains significant. He recognizes Doraemon's insecurities and facilitates his growth, such as arranging a soul-searching trip. He maintains trust in Doraemon and his friends ("The Doraemons") despite their destructive antics and academic failures, acknowledging their potential for good.

Beyond Doraemon's origin story, he appears in spin-offs like "The Doraemons" series as a recurring mentor. During the climax of the origin story, he delivers a replacement four-dimensional pocket as a Christmas gift after Doraemon loses his original, reinforcing his ongoing supportive role.

His family includes four identical younger brothers pursuing different careers. Two brothers appear: one operates an undersea aquarium, and another owns a seaside surf shop, indicating diverse paths despite their resemblance.