A list of the characters appearing in The Royal Tutor.
- Voiced by: Keisuke Ueda (Japanese), Micah Solusod (English)
The titular Royal Tutor.
- The Ace: Ridiculously good in just about anything he does. When Bruno challenges him to a series of tests to test his worthiness as a tutor, Heine dominates them all.
- Badass Adorable: This cute, childish looking tutor managed to beat up several grown men on his own without breaking a sweat.
- Badass Teacher: Heine may appear like a child but as seen when Fuchs and his mooks physically threaten Kai, he alone is more than enough to take care of them. And even before then, he easily catches up to the fleeing Leonhard on horseback and casually proves his intelligence and smarts to the already brilliant Bruno.
- Berserk Button: Being mistaken for a child, and he has Height Angst.
- Brutal Honesty: Heine does not hold back on his opinion on things or if the person needs a stern wake-up call. One instance is telling Leonhard that one of the many reasons why he did so poorly on Heine's competency test is because he chased away several tutors.
- The Comically Serious: Most of the humor comes from his deadpan reactions to the royals' craziness.
- Curtains Match the Windows: Orange-red hair and eyes.
- Dark and Troubled Past: Implied to have one.
- Deadpan Snarker: When a majority of the rest of the main cast is a Cloudcuckoolander in some way, it's unavoidable.
- The Gadfly: There are moments where he's just messing around with the princes—Licht in particular is rather easy for him to tease. At the very least, when Licht is paranoid that Heine caught a glimpse of his plans to leave the palace, Heine repeatedly pulling a Bait-and-Switch to make it seem as though he did before making it seem that he didn't—when he did—was really just him screwing with Licht's head.
- Heterosexual Life-Partners: With Viktor. The specifics aren't clear but they have been friends for years, Viktor is the first person Heine could trust and Viktor entrusts his sons to Heine despite knowing the latter's Dark and Troubled Past.
- In the anime, it's revealed that as a teenager, Heine was the leader of a group of homeless children. Viktor met him on one of his excursions sneaking out of the palace. Heine's situation opened Viktor's eyes to the reality of the kingdom, and they became friends, initially without Heine knowing that Viktor was a prince.
- Mistaken Age: Becomes a running gag as people who first meet him often thinks he's a child due to his extremely short height much to his annoyance.
- Mistaken for Paedophile: Played for laughs when Adele tells Beatrix that Heine asked her to marry him (he was just playing make believe).
- Not So Above It All: Gets a little forgetful when "surrounded" by Licht's "company".
- Private Tutor: What he is currently. Before, he used to teach at a church.
- Redheaded Hero
- Saying Sound Effects Out Loud: A Running Gag with him, such as snatching Leonhardt's diary and going "Step step step step step! Roll roll roll roll roll!" as he scuttles away from him then rolls under the couch.
- Stern Teacher: Won't mince any words with his students and will resort to Tough Love if he has to, but he's genuinely invested in their growth and they adore him for it.
- Straight Man: To the antics of the royal family.
- The Stoic: Heine rarely shows changes in his facial expression but when he does, it's subtle.
- Terrible Artist: The one thing he doesn't excel at is art.
- Wouldn't Hurt a Child: His personal philosophy. He restrains Fuchs with minimal force and even saves him from collateral damage, simply because he is a child with a bad lot in life.
- Adorkable: They're all rather quirky and occasionally lacking in common sense, but in a well-meaning sort of way that comes off as rather endearing.
- Bishōnen: They're all remarkably good-looking, with Heine commenting on how it's as if they stepped out of a painting.
- Breaking the Fellowship: As of Ch. 53, they've all gone their own ways: Licht leaves the palace to live outside and pursue working at the cafe full-time, Bruno goes on an international exchange to Orosz, and Kai departs for a month for military training. Meanwhile, Leonhard stays behind at the palace.
- Friendless Background: Played for Laughs. When Kai returns to military school and manages to make a friend, the other princes are thrilled for him... only to realize at the end of the chapter that, in spite of worrying about Kai, none of them have any friends either.
- Friendly Rivalry: Despite being rivals for the throne, they're all extremely supportive of one another. When Leonhard starts missing the "friendly" part of things, the others have to make it a point to tell him that rivals doesn't mean enemies.
- Hidden Depths: Their debuts and interviews are essentially about displaying an archetype and subverting it, with their subsequent spotlight chapters/episodes elaborating further.
- Kai initially seems cold and hostile, with a reputation for violence, but he's revealed to be a gentle pacifist and the only prince who fully accepted Heine from the beginning. Eventually, he's shown to have remarkable emotional fortitude, with the willingness to face those who might hurt him being the backbone of his development.
- Bruno seems like a haughty know-it-all, but turns out to be a humble student who's elated to have a tutor who can actually teach him for once. Furthermore, in spite of seeming to be the most competent prince, he's actually one of the most insecure.
- Leonhard, like Bruno, appears rather arrogant at first, and while in some ways he really is that cocky, he's also much more kindhearted and childish than he seems. And, Book Dumb he may be, he has a natural sense of inventiveness that even Bruno envies.
- Licht comes off as flighty and irresponsible, but he's also surprisingly perceptive and observant, such as correctly guessing that Heine isn't exactly a normal tutor, and being able to see through his sleight-of-hand trick after seeing it only once. In addition, he loves his job as a waiter and takes it very seriously, and genuinely appreciates everything he's learned while working there. He's also stated to look up to his father and his boss at the cafe for both of them being hardworking men who take their jobs seriously, and wants to be like them.
- King Incognito: For safety reasons, they hide their identities as royalty whenever they're wandering around town.
- Modest Royalty: Typically, they just wear their fairly plain uniforms.
- Rich in Dollars, Poor in Sense: Whoo boy. Simply put, Licht is the only one to have walked around town, and even he's rather clueless about how commoners actually live. Leonhard is the worst of the lot; Heine notes that if he weren't born a royal, he wouldn't have been able to survive.
- Royals Who Actually Do Something: None of them quite have enough influence to be this just yet, but they're all aiming to be this trope.
- Sharp-Dressed Man: Their civilian outfits.
- "Well Done, Son!" Guy: They all want to make their father proud.
- Voiced by: Yuuya Asato (Japanese), Daman Mills (English)
The second prince.
- Adaptation Dye-Job: The anime takes his light brown hair and makes it a very pale blond instead. With that said, his hair does appear blond in later illustrations, making the brown hair a potential case of Early Installment Character Design Difference.
- All-Loving Hero: The only prince who's happy to see their father—exaggerated to the extent where Heine notes that it's less Kai is strong-hearted as it is that he, er, sees things on a galactic scale. Also, he's the only prince who claims to like Eins.
- All of the Other Reindeer: Though his family loves him dearly, he's ostracized by others as they all fear him, in a combination of him having the Face of a Thug and his ill reputation.
- Arranged Marriage: With Beatrix.
- Beware the Nice Ones: He's normally the All-Loving Hero among the princes. With that said, hurting those he cares about is a Berserk Button for him, and if you value your well-being, you'd do well to avoid pressing it.
- Big Brother Instinct: Fuchs found out the hard way why hurting Bruno in front of him is not a good idea.
- Cloudcuckoolander: Is often off in his own world.
- Charles Atlas Superpower: He can single-handedly carry a statue larger than he is tall, much to the shock (horror?) of everyone around him.
- Cuteness Proximity: He loves cute and soft things/people.
- Death Glare: What the servants think he's giving them.
- Face of a Thug: He's a very nice guy, but because he looks like he's always scowling, everyone except for his family is initially too scared to approach him.
- Friend to All Living Things: Loves animals, especially the soft and fluffy ones.
- Gentle Giant: His shyness is often misunderstood as unfriendliness.
- Kissing Cousins: He's engaged to Beatrix, who's a cousin on his mother's side.
- Lazy Bum: It's less apparent in later chapters, but early on, he apparently finds it tiring to even breathe.
- Licked by the Dog: Exaggerated. After Kai's return to military school, the others see cats being drawn to him, revealing his soft side... only for him to be completely buried in them, at which point all emotions turn to concern for his well-being.
- Misunderstood Loner with a Heart of Gold: Reputed as violent and temperamental, but is in fact an All-Loving Hero and Gentle Giant. Licht lampshades him being this trope at one point, calling it the "all-too-common pattern where someone you thought was scary turns out to be a gentle soul".
- No Social Skills: Not very good at talking and socializing with people, but is slowly improving thanks to Heine.
- Not Good with People: He is shy and unsure around anyone who isn't his family, but animals seem to be naturally drawn to him.
- Oblivious to Love: Kai seems unaware of Beatrix's romantic feelings for him during the first chapter Beatrix appears in. In a later chapter, it is revealed that Kai sees her as family. Whether that means as his future wife or simply as his cousin becomes a source of anguish for Beatrix.
- Peek-a-Bangs: Of the shy type.
- The Quiet One: He's not great with words and so prefers to keep quiet, although it doesn't help his ill reputation any.
- Slasher Smile: When he tries to smile the result makes him look like a serial killer.
- Smarter Than You Look: Licht is rather surprised to hear that Kai did well on the competency test. Bruno, on the other hand, points out that Kai always gets good marks.
- Turn the Other Cheek: To an extent. Though he admits that he can't forgive Fuchs, he's still willing to give him another chance as that's the kind of kingdom he wants: one where anyone can start over.
- The Unintelligible: He's rather soft-spoken and mumbles sometimes. For instance, his first impression on Heine appears to be him saying "Get lost." However, he was actually saying "I hope we get along."
- Voiced by: Yuto Adachi (Japanese), Christopher Wehkamp (English)
The third prince.
- Adaptation Dye-Job: Like Kai, he has brown hair but is blond in the anime—though like Kai, his hair becomes increasingly lighter in illustrations as time goes on, making it unclear exactly what shade he's supposed to have/if the anime is actually a change.
- Adjusting Your Glasses: By the bridge.
- All of the Other Reindeer: He was hated and bullied in military academy due to other students resenting him for being a prince.
- Animals Hate Him: Much to his dismay, when he's the only one at the petting zoo with no luck feeding the animals.
- Aw, Look! They Really Do Love Each Other: Despite Licht having told him earlier that he wished Bruno wasn't his brother, Bruno makes it very clear that no matter how much he and Licht may fight, Licht will always be his dear brother.
- Big Brother Instinct: Not so obvious as Kai, but he cares a lot for the younger siblings. In the manga he once almost went to town in the middle of the night to look for Licht, after the latter didn't come back for dinner after an argument.
- Big Brother Mentor: To Leonhard.
- Brainy Brunette: Brown hair unlike his siblings (blond in the anime, but as a notably darker shade and so still giving the impression of this trope), and the resident Teen Genius.
- Broken Ace: The most distinguished of the four, with perfect grades, respect he's earned for the papers he publishes, and someone whom his brothers depend on—Leonhard in particular views him as perfect. Inside, though, Bruno's terrified that Hard Work Hardly Works and hates that he's secretly a Green-Eyed Monster even towards his siblings.
- Defeat Means Respect: Humorously exaggerated. After Heine beats him in every test he could come up with, while showing him along the way that he still has much to learn, Bruno begins to call him "master", and practically hero-worships him.
- Foolish Sibling, Responsible Sibling: Bruno is a stickler for manners, tidiness, and duty, whereas Licht is just about the opposite of all those things (though, unbeknownst to Bruno, he's not actually as lazy as he seems).
- Green-Eyed Monster: His self-admited Fatal Flaw is that he gets easily jealous of more talented people. However, he does his best to keep it at check.
- Heroic Self-Deprecation: Though he tends not to be open about it, his self-confidence is actually rather shaky. Ch. 23/Episode 7 has him often initially assume he failed when he in fact succeeded, and he doesn't seem to be completely aware of just how much he's done for Leonhard until Leonhard lays it out for him.
- Humble Hero: Despite his many accomplishments, he is very aware that he isn't a genius like Eins and that, had he been born a commoner, he would have been an ordinary man.
- Lonely Rich Kid: Not quite lonely, but being royalty did him no favors in military academy and it's eventually revealed that he hasn't entirely gotten over it and is understandably wary of trying to befriend any peers his age.
- Neat Freak: Obsesses over how books should be placed on a shelf, and refuses to have a game of chess until the chess set is spotless.
- No Social Skills: He has no issues with public speaking or anything in a professional capacity, but he can be rather awkward in a more casual context.
- The Smart Guy: His superior intellect is admired by his brothers, and in particular, by Leonhard, who plays the opposite trope The Fool.
- Smart People Wear Glasses: The most studious of his brothers, and wears glasses.
- Stoic Spectacles: He wears glasses and tends to be one of the more down-to-earth princes (most of the time, anyway).
- Team Dad: And Team Mom, depending on the context. He frequently takes it upon himself to fuss over his siblings—Kai included—whether that means lecturing them (see: half his interactions with Licht) or looking after them.
- Teen Genius: He's already speaking at universities at sixteen.
- Vitriolic Best Buds: With Licht, because of their very different personalities and outlooks in life. They are the only brothers who have had serious fights with each other.
- Voiced by: Daisuke Hirose (Japanese), Alejandro Saab (English)
The fourth prince.
- Big Brother Instinct: He is very protective and caring towards Adele.
- Big Brother Worship: Idolizes his older brother Bruno.
- Bishounen: All the brothers are this, but it's especially highlighted in his case since when he's introduced he's known as the most beautiful prince on the continent.
- Book Dumb: Oh boy...despite being fifteen, he apparently didn't even know what's 1+1!
- Brainless Beauty: Being acclaimed as the owner of the most beautiful face on the entire kingdom, Leonhard, or the 'White Lily of Grannzreich', is amazed when receives the unprecedented score of 15 out of 100 on a test.
- Bratty Half-Pint: Due to his childishness, he can act this way towards Heine (and occasionally others outside of his family) despite being in his teens already.
- Characterization Marches On: Leonhard initially comes off as someone who gave off a haughty, vain vibe in addition to his beauty, causing readers to think that he's going to be the stuck-up prince who looks down on commoners, but as the series goes on, he became more of Butt-Monkey, with his Book Dumb tendencies, penchant for clinging to people, and general childishness being emphasized. Lampshaded by Heine, who mentions that he completely forgot about it when he was reminded that Leonhard is actually known as the "White Lily of Granzreich" because of his beauty. Even the mangaka herself wondered how this happened in the extras that came with Volume 1. The anime resolves this by making the prior more of a quickly squashed jerkassery front.
- Cuteness Proximity: Towards a marmot in the zoo episode.
- Defrosting Ice King: Out of all the princes, he takes the longest to warm up to Heine.
- Dumb Muscle: The most athletic of the four princes and by far the most Book Dumb and ditzy.
- Easily Impressed: As made apparent on the trip to the city and the visit to the zoo. Also, the reason why Bruno's attempt to teach him basic math ended up backfiring.
- Genius Ditz: Where Leonhard fails at academic studies, he excels in physical activities like running, horse back riding and fencing.
- Green-Eyed Monster: He's briefly jealous when he learns that Heine has had pupils before the princes. To a lesser but more consistent extent, he tends to fume a tad whenever Bruno's giving someone else attention or praise.
- Kiddie Kid: With his attitude, you'd be forgiven for thinking he was the youngest prince, not Licht.
- Literal-Minded: Every time he's called the White Lily to his face, all he does is insist that he's not a plant, apparently unaware that he's being complimented.
- No Social Skills: Struggles with even basic manners (and knows it), and when volunteering to help Kai with the latter's own lack of people skills, Leonhard admits that he's not good at socializing with others either.
- Sweet Tooth: He loves torte.
- Tsundere: For Heine, in a teacher-student way.
- Wide-Eyed Idealist: When the princes are talking about the sort of kingdom they want to create, Leonhard says, without a hint of irony, that he wants to beat up all the bad guys and make a kingdom full of good people. The other princes can't avoid being amused at his simplicity.
- Voiced by: Shouta Aoi (Japanese), Stephen Sanders (English)
The fifth and youngest prince.
- Annoying Younger Sibling: Occasionally, to Bruno and Leonhard.
- Aw, Look! They Really Do Love Each Other: See Bruno's section. On Licht's part, he breaks into tears and offers Bruno an apology gift, deeply regretting what he said.
- The Charmer: Known for having a bright, charismatic personality and being popular with women.
- Chivalrous Pervert: He's very fond of the ladies, to the extent of secretly owning porn magazines, but he's also the sort who wouldn't hesitate to protect one from harm.
- Even the Guys Want Him: His charms attract males too. A male ostrich, but still.
- Foolish Sibling, Responsible Sibling: With Bruno, whom Licht is the complete opposite of (minus the part where Licht's a lot more hardworking than he'd care to admit to others, at least). He's light-hearted and playful, next to Bruno's serious and studious attitude.
- I Choose to Stay: He decides to leave the palace and has no interest to become king, but instead live independently and as a normal person working as a waiter.
- I Just Want to Be Special: Of sorts. He's very attached to his image as the "cool playboy" and, despite actually being rather serious and hardworking at his job, seems to think that being viewed as so would be a nightmare. Heine's fond of teasing him by calling him "ordinary".
- Living a Double Life: To his family and friends, he's the flighty and fun-loving prince, but to the customers and employees of Cafe Mitter Meyer, he's Richard, a hardworking waiter.
- Long-Haired Pretty Boy: He has rather long hair compared to the rest of his family.
- Non-Idle Rich: Works part-time at a cafe. Eventually subverted when he starts working full-time—after leaving the palace, meaning that he's now completely independent and actually poorer than Maximilian, his guard.
- No Sense of Personal Space: Licht is very fond of hugging and getting close to others.
- Not So Different: Heine remarks on him being this with Bruno during one of the two's spats—they share the same stubbornness. Licht, for his part, is horrified at the thought of being anything like Bruno.
- Only Sane Man: He's not without his quirks, but he's at least usually intentionally weird, whereas his siblings are blissfully so, and in fact has rather ordinary sensibilities (as Heine loves to poke fun at). When the princes are to draw a portrait of Adele, his is the only normal one, compared to Kai's abstract painting, Leonhard's childishly cute one, and Bruno's In-Universe Accidental Nightmare Fuel.
- Parting Words Regret: Downplayed, but though he denies caring when Heine brings it up, it's evident he wishes he got to make up with Bruno before Bruno left for his international exchange in Orosz.
- Primal Fear: He's scared of animals and does not come near or touch them, not even their family pet Shadow, since they are very affectionate toward him.
- Purely Aesthetic Glasses: When secretly working on a cafe under the alias of Rich.
- The Slacker: His contribution in driving off all of the previous tutors? They found it impossible to motivate him to study, as he'd rather goof off instead.
- The Social Expert: "Expert" might be an exaggeration, but he prides himself on being able to read people and his customer service skills, and he's notably the only one among the four princes who doesn't suffer from No Social Skills.
- When You Coming Home, Dad?: He resents their father for never being around whenever he was sick as a child, though he eventually comes to understand that Viktor was genuinely too busy to, rather than uncaring.
- Younger Than They Look: He's fourteen, but definitely doesn't look like it, and the way he acts doesn't help, either.
Other members of the Granzreich Family
The King of Grannzreich and father to the princes and princess.
- Absurdly Youthful Mother: Gender-flipped. Viktor appears as young as his sons.
- Amazingly Embarrassing Parents: There's a reason why none of them (sans Kai) are elated to see him, let alone in front of Heine.
- Doting Parent: The sort to cry just by seeing his children, and can't even bring himself to spar with Leonhard.
- The Good King: He's responsible for leading his country into prosperity. The fact that he's such a good king is part of why his sons are determined to follow in his footsteps.
- Master Swordsman: Reputed as the strongest swordsman in the country.
- Ocular Gushers: Is prone to these around his sons.
- Puppy-Dog Eyes: In episode 6, he flashes these at the owner of Licht's cafe, effectively causing the latter to hire him for a few hours.
The eldest prince, and the one most people believe will be the next king.
- Aloof Big Brother: He greets his brothers, who he hasn't seen in months, by throwing their welcome present to him away and doesn't seem to have any interest in having a good relationship with them.
- Berserk Button: People thinking he looks older than his father.
- Perpetual Frowner: His default expression in any circunstance.
- Slipknot Ponytail: Wears his hair styled this way.
- Tall, Dark, and Handsome: He is as attractive as his father and brothers, but unlike his blond and blue eyed family he has dark hair.
- Younger Than They Look: Mild example, but he looks older than his own father.
- Voiced by: Michi Matsui (Japanese); Jad Saxton (English)
The youngest child and only princess.
- Arranged Marriage: A chapter of the manga has her deal with the knowledge that someday she will enter one of these and will have to leave her country. Next chapter implies a fiance has been chosen for her, though obviously she is not going to get married anytime soon.
- Cheerful Child: Always seen smiling,
- Precocious Crush: She has a crush on Heine.
- The Baby of the Bunch: The youngest Granzreich child and eleven years younger than Licht.
- The Smurfette Principle: She is the only girl in her family.
Cousin to the princes and Kai's fiancee.
- Bifauxnen: She looks like a young man.
- Cool Big Sis: She is one to the younger princes, having looked after them when they were younger.
- Dogged Nice Guy: She is persistent in trying to spend more time with Kai to demonstrate her love for him, but he appears to be Oblivious to Love.
- Kissing Cousins: She is engaged to her cousin Kai.
- Like Brother and Sister: She worries that this is the type of relationship she has with Kai, when she clearly wants to do more romantic things with him.
- No Guy Wants an Amazon: Beatrix believes that, since she is tall and not feminine enough, she does not fit Kai's standard of cute things.
- Perfectly Arranged Marriage: She is quite enamored with Kai and is content to be his fiancee.
- Relationship Upgrade: What she would really like with Kai.
- She Cleans Up Nicely
- Through His Stomach: Beatrix attempts to make Kai's lunch during their picnic to show her more feminine side to him. Unfortunately for her, Kai's grandmother prepared lunch for them.
- Wholesome Crossdresser: It is not that she does it deliberately. She just dislikes wearing filly dresses.
One of the palace guards.
- Voiced by: Daisuke Namikawa (Japanese); Jarrod Greene (English)
One of the palace guards.
Eins's high steward.
- Voiced by: Katsuyuki Konishi (Japanese)
The owner of Cafe Mitter Meyer.
- Married to the Job: That he has no time for a relationship is a long-running gag that the cafe employees use to poke fun at him.
- Nice Guy: He's noted to be a very good guy, hence why Heine is unconcerned about leaving Licht under his care.
- No Name Given: Always referred to as the cafe's owner or master.
A professor in the field of sociology from Orosz, whom Bruno highly respects.
- Bunny-Ears Lawyer: Far more jovial than Bruno (and Ludwig) expected him to be, but still a well regarded professor.
- Voiced by: Shinya Hamazoe (Japanese); John Swasey (English)
Dr. Dmitri's assistant.
- Beleaguered Assistant: For Dr. Dmitri.
- Hidden Depths: He's a very good cook, and his food is surprisingly... cute.
- Only Friend: He's shaping up to be this for Bruno during Bruno's time abroad.
- The Resenter: He admits that he's jealous of how Bruno can follow in his father's footsteps whereas he broke off ties with his family to pursue his dream of becoming a scholar—though he knows this is petty of him, and he assures Bruno that he doesn't actually hate him.
- Sugar-and-Ice Personality: He comes off as rather cold and intimidating, but he's actually a fan of Bruno's work and, after clearing up the air about not hating him, does try to be a bit warmer.
- Voiced by: Keito Okuyama (Japanese); Justin Briner (English)
A son from a noble family who attended military academy at the same time as Kai and Bruno.
- Bitch in Sheep's Clothing: When Kai wants to talk, Ralf presents the image of a subdued, repentant young eager to make amends, but it's quickly revealed to one big, damn lie.
- I Have No Son!: His family disowned him after what he did, fearful that the scandal would ruin their reputation.
- Jerkass: Between bullying Bruno and trying to hold Kai, Heine, and Maximilian hostage for ransom? Big time.
- The Resenter: Towards Bruno in military school for being royalty.