Yotsuya

A mysterious man whose hobbies include mooching, voyeurism, and generally tormenting his next-door neighbor Yūsaku directly and the manager Kyōko indirectly. He is infamous for breaking holes through the adjoining wall between his and Yūsaku's rooms in order to be with "young Godai", as well to use the smaller hole in Yūsaku's other wall to peep into Akemi's room. He is willing to reveal the secrets of others if it benefits him, such as telling Kyoko what Godai does at night, in order to prevent the hole from being repaired. He is usually seen dressed in a business suit, a yukata, or other formal attire, and tends to speak in a very formal manner (even while drinking and partying with Akemi and Mrs. Ichinose), but what life he may have outside of Maison Ikkoku is a complete mystery to everyone. Yotsuya claims to have a job (but is not above stealing Yūsaku's food) and comes and goes at odd and changing hours, keeping a schedule known only to himself. His true name is never known; in fact he has provided multiple given names, including Tamezo and Goro. An album in Maison Ikkoku's attic found by Kentarō reveals that the history of Maison Ikkoku is his family history.