Faux Affably Evil: Oh sure, he'll say he wants to help the guests, offer them a place to stay, and calls the Guests "my friend/my dear," but he'll do it while breaking their psyches, swallowing human souls, and actively planning to feed them to his mother.
The Guest is the main character of the first two seasons, with everything seen from their eyes. The First Guest is a working man with a wife and son, and the Second Guest is a working woman who struggles with the decision of Career Versus Man.
Badass Normal: The Second Guest deserves this for the fact that at one point she, rather than just take Gregory's BS, picks up an ax and chases him off with it.
Downer / Bittersweet Ending: Neither Guest manages to escape the hotel, and returns to stay forever. The First Guest quite likely becoming Haniwa Salaryman, and the Second Guest becomes a member of Gregory's family.
Cats Are Mean: Actually he's not a bad guy and genuinely wants to help guests escape if he can, but he's understandably bitter about what was done to him and so he can be snappish. Approaching him during certain times in the game, specifically when he's very hungry, will cause him to attack you.
Insane Troll Logic: Perhaps not outright insane logic, but the scenarios he presents and the consequences of the choices made don't necessarily have to happen the way he tells them. Then again, in most cases he's reminding the guests of things that already happened.
The Other Darrin: In the English dub he was apparently played by one man, but had three different voices and personalities: one at the end of the first season who was very no-nonsense (understandable, given the situation) and outright told the guest that he might not be happy going home, one for the rest of the series who was calmer and gentler, and one in the game who was much more upbeat and had a very noticeable Brooklyn accent.
Murder the Hypotenuse: In The Second Guest, she 's furious at the female guest for rejecting her brother, and believes Gregory to be her boyfriend...so she threatens to kill him if the guest doesn't date her brother.