Voiced by: Jaden Smith (English), Junji Majima (Japanese)
The protagonist. A "magistocrat" more concerned about his status as an eligible bachelor than his exorcism duties. The latest in a long and proud line of demon slayers, Kaz has strong magical abilities that allow him to detect demonic possession, expel demon presences, and battle even the most formidable of demons on an even footing. For hundreds of years it's been his family's duty to protect Neo Yokio from demonic threats. Despite this, Kaz tends to treat his magical duties as a chore he'd rather put off — it's a good thing he's got his Aunt Agatha to keep him in line. Kaz also has a taste for expensive clothes and a tendency towards fits of dramatic melancholy, but ultimately his heart's in the right place.
- Action Fashionista: Kaz has a great love of clothes and prides himself on his personal fashion. If he's stuck fighting demons, he's going to make sure he looks good doing it.
- Alliterative Name: Kaz Kaan.
- Ambiguously Brown: His race is never specified. Given how the rest of his family is light-skinned, we can infer that he's bi- or multiracial.
- Angst: Much is made of Kaz's melodramatic reactions to the hardships of being a wealthy bachelor with magical powers - it's mostly played for laughs.
- The Dandy: Kaz is highly knowledgeable about not only current trends, but also the business, history, and politics of fashion.Kaz: While I’m gone, write 1,000 words on the graceful geometry of cable-knit sweaters.
- The Eeyore: Kaz is prone to mood swings and philosophizing about how bleak the world can be - it's mostly his flair for dramatics.Kaz: Who cares what time it is when the future is an interminable abyss of wackness.
- Heroic Lineage: Much to his dismay, Kaz comes from a long line of supernaturally gifted demon exterminators.
- Idle Rich: Kaz would prefer to spend his time playing field hockey, shopping for suits, and improving his standing on the bachelor board - but his Aunt Agatha keeps him busy with various tasks that only a magic user can do.
- There are even hints that he is such an idle and shallow man, he actually feels ashamed he needs to work for his money, different than Archangelo, who has old money and can just spend his day with hobbies.
- Meaningless Meaningful Words: Kaz likes to sound deep and thoughtful... not that there's much weight behind his words.Kaz: Sorry guys, but I can barely navigate the hellish vortex between breakfast and dinner, let alone the labyrinth of the field hockey field.
- Rose-Haired Sweetie: A Rare Male Example.
- Unsympathetic Comedy Protagonist: Kaz is a jerk to many of his friends and generally to anyone who needs anything from him. He dislikes having to work despite his family depending on him and only begrudgingly accepts requests when forced by his aunt, complaining during the whole time and when he faces drama, he acts with so many levels of Wangst that it's hard to care or even not laugh at him.
- Witch Species: Odd hair colors and magical powers seem to run in the Kaan family bloodline, and presumably in the blood of all modern magistocrats. The historical backstory in the first episode reveals that the ancestors of the magistocrats were shamans and mystics from "the old country," but it's unclear if those those shamans and mystics inherited their powers or gained them through other means.
Voiced by: Jude Law (English), Yasuhiro Mamiya (Japanese), René García (Latin American Spanish)
Kaz's robotic butler, friend, confidant, and closest thing to a jet pack Neo Yokio has to offer. Charles often acts as the calm, British voice of reason for Kaz, encouraging him to think his decisions through before taking any action. Kaz purchased Charles second-hand, though he seems to have very little idea as to how mechabutlers work.
- Instant Awesome: Just Add Mecha!: He's not just a butler - he's a mechabutler with rocket boots.
- The Jeeves: Charles is in charge of Kaz's schedule as well as tasks like packing, getting articles of clothing repaired, taking calls, and transporting Kaz around the city with his rocket boots. He also reads to Kaz in the bath and accompanies him on missions.
- Mini-Mecha: Charles looks to be about seven or eight feet tall, but he looks and functions similar to a full-sized mecha, complete with rocket boots.
- Robot Buddy: Charles accompanies Kaz on many of his missions. Subverted in that Charles isn't actually a robot, but a mecha piloted by a small British woman.
- Robot Maid: The male equivalent of this.
- Shout-Out: Pilot Sadie states she works by synchronizing her brainwaves with Charles' programming, similar to how EVAs and their pilots work.
- Walking Spoiler: Sadie's existence.
- Yes-Man: His role is simply to agree and praise Kaz's every action, hardly ever reprimanding him, no matter how right it would be to do so.
Aunt Agatha Kaan
Voiced by: Susan Sarandon
Kaz's aunt - a strict, no-nonsense woman who runs the family business. Agatha tends to put business before personal commitments, often scheduling jobs for Kaz despite his protests (or prior commitments). She and Kaz have a close if somewhat contentious relationship, with Agatha acting as Kaz's manager, motivator, and something of a mother figure. It's assumed that as a magistocrat she has powers similar to Kaz and Jeffrey, but as of yet she has not displayed them.
- Cloudcuckoolander's Minder: To Kaz, who is such an Idle Rich, she has to ensure he understands what needs to be done for the family to keep their money and status. The money and status he so adores, but loathes having to work for it.
- Conspicuous Trenchcoat: Wears a full-length khaki trench coat belted at the waist, along with dark sunglasses and a scarf no matter the weather or occasion.
- Cool Shades: Owns a pair and is never seen without 'em.
- Curtains Match the Window: Lavender hair, purple eyes.
- Hidden Depths:
- She doesn't care for the status of being a magistocrat, only for the money. She has many times pointed out that because the Kaans are the very definition of Nouveau Riche, the rest of high society doesn't really accept them.
- She greatly values her family, even if her way of expressing it can be gruff and indirect. She cares for Kaz enough to help him out every now and again, and her attempts to teach him responsibility through work are just her way of trying to prepare him for the harsh realities of life as a magistocrat. When push comes to shove, she's willing to go toe to toe with the Remembrancer (up to and including chasing the man all the way to Jersey in a helicopter) to keep Kaz out of serious trouble. She also expressed distress at the fact that her nephew, Jeffrey, wasn't willing to make an appearance at his own father's funeral. It's likely that she viewed this as a betrayal of the family, seeing as she openly called Jeffrey an ingrate at the funeral and was totally unfazed by the prospect that he would be out on the streets if she sold the house in the Hamptons.
- My Beloved Smother: Fills this role for Kaz.
- Only in It for the Money: She only cares about being paid and is shown to be largely distant to many other issues, even social events, as she acknowledges her status as Nouveau Riche will forever stop other aristocrats from seeing her as one of them. Played for Laughs in some instances, like when she tells Kaz she's rented out his apartment to a family of German tourists during Grand Prix weekend and fails to see why he's so upset.
- Pet the Dog: In "O, The Helenists", she acknowledges how hard Kaz worked on his latest assignments and sympathizes with his pain over losing a spot on the bachelor list.
- Sunglasses at Night: Agatha always seems to have a pair of sunglasses on hand. She wears them to restaurants, to jobs, to the salon, and every other time she appears on screen.
- Witch Species: The same as Kaz.
- You Gotta Have Blue Hair: Agatha's hair is a pastel shade of mauve.
Lexy and Gottlieb
Voiced by: The Kid Mero (Lexy), Desus Nice (Gottlieb)
Lexy and Gottlieb are Kaz's long time friends, field hockey team mates, and occasional partners in crime. The two seem to have known Kaz since their days at Easton Prep School and often accompany him to social events, casual brunches, and shenanigans. During the course of the series they patent a trendy new martini and open a two-seat bar in Neo Yokio's crowded drinking district.
- Attractive Bent-Gender: Turned into a woman, Lexy "Legend" is so hot, both Arcangelo and Matoko Goldberg("the hottest lesbian on Long Island," according to Lexy) want to get with "her."
- Heterosexual Life-Partners: The two are never seen apart from each other, attend the same functions (wearing matching outfits), play the same sports, and they go into business together when they open a bar selling a drink they co-patented. There's not much evidence for a romantic relationship between the two, but they clearly care about each other.
- Hypocrite: Downplayed. Lexy makes a huge speech on consent,sexism,gender,sexuality, how gender works in a spectrum, not a binary, but that's right after he used his newly acquired female body to make out with a lesbian, despite never stopping to identify himself as a man.
- Named After Somebody Famous: The two of them are named for German philosopher Alexander Gottlieb Baumgarten.
- Shout-Out: Due to some magical aquatic shenanigans, Lexy and Gottlieb find themselves transformed into an attractive woman and a panda, respectively. That's pretty much how the plot of Ranma ½ worked.
- Those Two Guys: Always shown together.
- What the Hell, Hero?: Lexy calls Kaz out for his inability to treat people, and especially women, right, and tells him the reason why none of his relationships work and so many women who actually get to spend time with him dislike him, is his incapacity to not try to command them. He then expands it to the fact that Kaz is so self involved that he genuinely doesn't know how to treat even his own friends right when push comes to shove.
Helena St. Tesoro
Voiced by: Tavi Gevinson
A socialite living in the expensive underwater neighborhood below 14th Street, Helena St. Tesoro is Neo Yokio's premiere fashion blogger... or she was, until a demonic possession, near drowning, and a nasty fall down a flight of stairs at the start of the series. The incident left her so shaken that she completely abandoned her blog, her fans, and her passion for fashion, turning her critical eye instead to Neo Yokio's culture of materialistic excess and extreme class stratification. She and Kaz clash numerous times during the first season, with Helena decrying Kaz as a "lapdog of the bourgeois" and Kaz arraigning her as a hypocritical rich girl, but they still maintain a friendly relationship.
- Bandage Babe: Starting in episode 2 when Kaz meets her in the hospital, she only wears a hospital gown and bandages around her head.
- Does Not Like Shoes: She goes barefoot from Episode Two onwards.
- Hikikomori: Self-described and Played for Laughs. She closes herself off in her room post possession.
- Jade-Colored Glasses: Helena's view of Neo Yokio, following her demonic possession.
- Love-Interest Traitor: Despite being in love with Kaz, she tricks him into helping her, and backstab him by switching places with Sadie and running away with Charles at the end of the show.
- Rei Ayanami Expy: Helena, a monotone and aloof woman with purplish-blue hair and purple eyes. After [being possessed by a demon and falling down a flight of stairs, Helena dons a hospital gown and head bandage for the rest of the series. Giving up her former life as a fashionista, she becomes reclusive and rarely shows any emotion besides her annoyance towards Kaz. She even steals and pilots Charles the mech-butler to escape Neo Yokio at the end of episode 6.
- Western Terrorists: After Helena blows up the Bachelor Board because it's a symbol of Neo Yokio's excess, she's wanted by the police and the Remembrancer.
Voiced by: Jason SchwartzmanKaz's rival in Field Hockey and for the top spot on the Bachelor Board, Arcangelo is classic old money Neo Yokio. Conceited and self-centered, Arcangelo wears his privilege on his sleeve like an vintage Rolex, and makes no secret of his rivalry with Kaz. He's got a gaggle of followers called the "East Side Gentlemen" who follow him around in order to laugh at his jokes, but doesn't seem to have many close friends.
- Alpha Bitch: A male example - Arcangelo is proud of his looks and high status, takes any chance he can to undermine Kaz's success in regards to the Bachelor Board (short of downright sabotage), and isn't above pulling punches when Kaz is down.
- Bishōnen: Arcangelo prides himself on his good looks and taste in fashion.Arcangelo: I love being in public when my hair's wet. I feel like a Gucci model.
- The Dandy: Just like Kaz, he cares a lot about culture and fashion.
- Girl Posse: Gender Flipped. As he's a male Alpha Bitch, he's also got a group of young men who follow him around and back him up on his stances.
- Privileged Rival: Older money than the Kaan family, and looks down on them for being "ratcatchers." It appears Arcangelo's casual anti-magistocrat racism is all part of an act to keep up his rank on the Bachelor Board - as soon as the Board is destroyed, Arcangelo is sincerely friendly towards Kaz.
- Punch-Clock Villain: Arcangelo and Kaz's rivalry for the top spot on the Bachelor Board is legendary, but when the Bachelor Board is blown up, Arcangelo drops all pretense of his feud with Kaz and makes a sincere attempt at being friends.
Voiced by: Annet Mahendru
- Alliterative Name: Mila Malevich
- Defector from Commie Land: It would appear that Mila defected to live the high life of a capitalist in Neo Yokio, rather for political reasons, so this trope only partially applies.
- Gratuitous Russian: Will often sprinkle Russian words in her dialogue.
- Vodka Drunkenski: Mila had zero qualms about going on a pub crawl the night before an important race. This turned out to be a ploy to get Kaz wasted so she could give him the slip and defect to Neo Yokio.
- Wearing a Flag on Your Head: The front of her racing suit is decorated with the hammer, sickle, & star from the flag of the Soviet Union.
- What Happened to the Mouse?: We never find out where she went or what happened to her after she ran away from Kaz.