* ThatOneLevel: The Triangle Towers in Lifecut are very unfondly remembered for making you explore ''10 identical towers''. Although they have StoryBreadcrumbs [[spoiler:(and dead bodies)]] in them, the legwork is mostly long and uneventful.
* UncannyValley: The art style for the characters tends to walk into this. Perhaps intentional, considering the subject of the game.
* UnexpectedCharacter: The "YAMI" chapter is a SequelHook for ''VideoGame/FlowerSunAndRain'', so many were expecting a character from that game to make an appearance. Absolutely nobody was expecting it to be [[spoiler:Catherine ''as a person'', since in ''FSR'' no indication is ever given that Catherine is anything more than a CompanionCube]].