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.
One-Winged Angel: He can become a ghost, usually in a desperate situation (the house burning down for instance).
Pet the Dog: He has his moments—mainly in the third and fourth seasons.
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. In the Manga the guest is a jobless 22-year old named Tooru Takenozuka
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.
What Happened to the Mouse?: Almost too literally with the second guest, after she becomes part of Gregory's family, she's never mentioned again.
Once part of a family that stayed at Gregory House and cause the Rat a lot of grief, Neko Zombie was seemingly taken apart, put back together,and had his face sewn up. He's usually in his room, shackled and moaning for food.
Adaptational Villainy: In the Manga, Neko Zombie is not the chained-up helpful character he is from the show or games. Instead he owns a fish catching game at a festival, teleports the main character into a giant pool and chastises him about being indecisive and hesitant to pick a dream, and is just as insane as everyone else.
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. And if you had chocolate on you he takes it without giving and item in return.
Dark and Troubled Past: There's the body-being-sewn-up thing, of course, but there's also a hint that something else has happened to him, judging from the way he states he doesn't deserve to leave to Angel Dog.
Historical In-Joke: The name "Jack Ketch", which is on his shirt, belonged to an infamous Executioner under King Charles II.
Kill It with Fire: How he destroys the hotel and tries to kill Gregory. It doesn't work because of the second guest's hesitation.
Red Eyes, Take Warning: Averted, though scary-looking and a little snappy, Neko Zombie is one of the few genuinely nice characters in the series.
A sad-looking little girl who continuously sobs because of her lost doll. Unbeknownst to her, she actually is the doll she cries for, which manifests itself as a blue nasty face on the back of her head.
Characterization Marches On: The first two season, her story has no conclusion and she never finds out where her doll is, In "The Last Train" she finds out the truth about herself via Talking to Themself, and in "The Bloody Karte" she seems to be co-existing with her evil side in the last episode.
Bunny-Ears Lawyer: For all his questionable methods and angry tendencies, his food is usually portrayed as tasting REALLY good. In the Manga, for example Tooru is initially not confident in the food, but states it delicious, to which Hell's Chef goes on a lecture about how taste and presentation are two different things, and requests that Tooru eat a Mushroom in his salad, which is revealed to cause paralysis.
Lethal Chef: Twice over, in fact! He can kill you with the ingredients that he uses, or if pissed off, cleave you with his knife.
Pride: cannot receive criticism, and only ever eats his own cooking.
Weaksauce Weakness: Gusts of air will blow out the flame on his head, causing him to stop moving.
A lizard woman who loves to draw blood with an over-sized syringe. Catharine is a lonely woman who desires someone to love, but her fascination with drawing blood, coupled with somewhat of a temper, makes everyone uncomfortable around her.
Father of Mummy Dog, Mummy Papa has a sword in his head, is just like his son. Easygoing and calm
Butt Monkey: slightly, but it's there. In Bloody Karte, for instance, he's stabbed in the head by Musha Dokuro because he was in a wall behind a painting the ghost attacked with a spear. there's no explanation.
Failed a Spot Check: Has an Arabian sword in his head...like his son, he doesn't know it's there. Despite constant splitting headaches.
Obliviously Evil: His horror show in Soul Collector is him giving you a poison pill in the hopes that it will make you feel better.
A strange-looking puppet/scale-like character who wanders about the hotel on a mounted track in the ceiling, He forces those he meets to answer his questions, usually involving a moral dilemma, and almost always chooses the more terrible answer, regardless of the individuals answer.
Adaptational Heroism: in the videogame, while not being overtly heroic, he doesn't foist a question on the player character like he does in the show (preferring instead that they have something with them for the judgment to happen), and is way more liable to drop the dollar sign if you answer his question correctly, giving you his soul as a prize.
Catch Phrase: "Do you know / Who I am? / They call me / Judgment Boy!"
In the video game, it's changed to "~Do you know my naaaaame?~"
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.
Sadistic Choice: His purpose to to present these to the Guest. Hopefully they're just hypothetical.
Averted for the game, where his questions are on the characters you've met.
A cactus cowboy who is always looking for a duel, but is actually very cowardly when danger presents itself. despite being armed with weapons, he almost always misses his mark, no matter how close he is to the target.
Gregory's mother who he grabs souls for to keep up her youthful appearance. However she is actually just as unsightly as her son, who she abuses constantly. She is a powerful sorceress, that combined with her Hair-Trigger Temper and insatiable desire for souls, make her terrifying when upset.
Only Sane Man: while initially a little bit rude to the first guest, They eventually do agree to at least try and help him out of Gregory House, and in the game, Clock Master is really civil until he finds out you stole My Son's screwdriver.
Papa Wolf: When Clock Master finds you stole something from My Son, he goes absolutely nuts and chases you though the halls until He strains his time control powers too much.
Too Dumb to Live: Clock Master eats poisonous peanuts in The Last Train, and eats them again in the same episode at the very end because he liked the taste.
What the Hell, Hero?: To get their soul, you basically have to steal from My Son, make his father fly into a rage and make him throw himself out so he doesn't come when My Son yells for him to get you, and extort the soul out of My Son so he can fix his dad.
An old frog woman who has a habit of appearing and disappearing at will to tell passerby their futures, sometimes for a price, sometimes for free.
Cool Old Lady: She seems generally kind, if a tad mysterious, and tells predictions to the First and Second Guest involving their predicaments. Compare that to when she made predictions for Gregory (who was too cynical to heed her) and Catharine (who she extorted, and didn't tell the entire fortune to).
The Cameo: Appears in The Second Guest for a few seconds behind Gregory.
A red-skinned boy with a board game spinner on his head. He's always literally drooling in anticipation for another game, yelling at people to spin his spinner. Though his game tends to have traps on unlucky spaces, he really is just an overtly playful kid and is a good sport when he loses.
Anthropomorphic Personification: He may represent the uncertainty in/fear of the future and where its going, As in The Last Train he disappears once Gregory reveals he does know where he's going, and in Another World His game revolves around Tooru's age and what will happen in his future.
Casino Park: what his room turns into when players have what he needs for them to play.
Graceful Loser: When you win, he gladly hands over his soul to you. It seems that afterwards, he just wants you to play again for his horror show, and you're just EXTREMELY unlucky.
Reality Warper: He can make doors appear and disappear, drops anvils out of nowhere, cause explosions, and transport the players into a Casino Park. Its much more prevalent in the Manga and "The Last Train".
Speed Mouse & Mutant Ducks
A pair of ducks who run the Speed Mouse, a hapazard roller coaster in some unspecified location of the house.
Two sides of the same character, Angel Dog is the friendly side, offering aid and guidance, but as her more devious Devil Dog persona, she often explains to people other than who she's guiding specific details about her methods of guidance.
Nice Guy: He's even nice to Gregory who has caused all of this trouble and chaos.
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.
Took a Level in Jerkass: though it was a light level. In the video game he seems less patient and a little rough towards the player character than in the cartoon.
Stephen Haniwa Salaryman
A Clay statue salary man who is completely wrapped up in his work. Needless to say, he's not all to happy with his life
Only Sane Man: Though his shtick is rather strange (and intrusive) He is actually a rather nice guy. In the Manga, he's the one who makes Tooru confront his feelings about the girl that recently moved into Gregory House for example.
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.
A mechanical mouse who's ears form a very unnerving set of jaws on his head. He's used by Gregory to go after the Second Guest, but ends up attacking Gregory Mama because of James.
The Dreaded: Gregory is outright scared when James is revealed to have what lures Mouse Trap to them. Similarly once James sees it, he flat-out obeys his Grandpa and runs off while its busy devouring Gregory Mama.
Tracking Device: How it finds its target; it is shaped like a gem encrusted brooch or buckle.
A living taxi that only ever goes to Gregory House