めぞん一刻
is an anime-only character whose exact intentions are left vague, but he appears to have been investigating Maison Ikkoku for a real estate development company wanting to buy it and build a new apartment complex on the ground. He decides that he likes the people living there, and ends his relationship with the development company. He stays in room 3 while living at Maison Ikkoku, and his name is the same as the large department store chain Mitsukoshi. The "Mitsu" in his name means "three". He is voiced by Katsunosuke Hori in the Japanese anime, and by Michael Donovan in the English version.