
Kuno's first reason for fighting Ranma in Ranma ½ is because he is living "under the same roof as Akane", a bit of a reversal. The aforementioned class representative even accuses them of "living in sin" until they explain the situation. Come to think of it, those activities are not mutually exclusive. Didn't help that they said, in unison, that they had to train, eat, play and sleep together. Of course, Those Two Guys and the Class Representative assume the worst when they come calling during the synchronization training she and Shinji must participate in. Later played closer to the trope when Asuka moves in. Misato and Shinji in Neon Genesis Evangelion, although this doesn't quite fit because the relationship is supposed to be parental rather than romantic like most relationships in the series, it's a bit more awkward and complicated due to the discrepancies of age and personality and their personal problems. Design flaw, or deliberate maleficence? You decide. intimate would wipe out Chii's memory and personality.
Though only the audience and about three characters in the story ever learn this, anything more. Nobody has ever commented on this, probably because Chii is a persocom and so expected to live with the main character.
Hideki and Chii in Chobits live together. She reluctantly accepts the bed to allay suspicion even though she would have preferred the closet, simply because she thought it was more cozy and had even brought along several items to help brighten the decor. Later in the series (Filler Arc in the Anime and Arrancar In Karakura Arc in the Manga) Rukia puts on her Schoolgirl facade for Isshin and is awarded a bed in Yuzu and Karin's room. Rukia, at first being the only facilitator of Ichigo's Shinigami transformation, stayed in his bedroom closet during the first season, simply for the convenience of being close enough to act should a Hollow appear. Used in Bleach, without romantic overtones. That her sisters live with her apparently reassures folks that nothing inappropriate is going on-which is ironically true. Starting with Those Two Guys, nearly everyone comments on it.
Belldandy lives with Keiichi originally because of the properties of the wish, and later, after that gets tossed out, just because why not. Later, damage to Natsuki's apartment forces her to move in as well, causing no small amount of tension. The girls are less than pleased ( especially Mikoto). 1 of My-HiME, when an Orphan damages the boys' dorm, pushing Yuuichi to shack up with Mai and Mikoto.