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Voiced by: Megumi KojimaOne of the twin princesses of the Sunny Kingdom, Fine is adventurous and athletic, but she is also very clumsy. She also adores cake, but is afraid of ghosts.
- All Girls Want Bad Boys: She has a definite crush on Prince Shade.
- All There in the Manual: Birthday lists Fine as 8 years old, with a height of 117 cms., her favorite color pink, and her hobby as "eating anything delicious."
- Big Eater: She's been this way since she was a baby as evidenced by her having two bottles in her and Rein's baby picture.
- Cool Loser
- Genki Girl
- Image Song: "Okashi na Okashi na Princess" ("Strange Sweet Princess")
- Lethal Chef: Never, never, ever, ever have her or her sister cook for you. Unless you have an iron stomach, you will regret it!!
- Magical Incantation: "Twinkle Bloomish!" in the first series and "Falalila!" in Gyu!
- Mega Twintails
- Official Couple: With Shade.
- Princess Curls: When transformed.
- Princesses Prefer Pink
- Red Oni, Blue Oni: The Red to Rein's Blue. She is literally Color-Coded for Your Convenience!
- Sibling Team
- This Loser Is You
- Tomboy and Girly Girl: Fine is the Tomboy to Rein's Girly Girl.
- Tomboy Princess
- Trademark Favorite Food: Fine sure loves her cake.
- Why Did It Have to Be Ghosts?: Fine is really scared of ghosts.
Voiced by: Yuko GotoThe other twin princess of the Sunny Kingdom, Rein adores dressing up and gets starry-eyed over romance. She also loves scary things and is more emotionally stable than Fine. Just like Fine loves her cake, Rein has eyes for Bright.
- All There in the Manual: Birthday lists Rein as 8 years old, with a height of 117 cms., her favorite color blue, and her hobby as "dressing up."
- Cool Loser
- Damsel in Distress: This basically sums up a lot of the Ship Tease scenes between Rein and Shade. Just strike her with a Distress Ball and he'll come running, although this can be justified with the fact that Fine is more athletic than Rein.
- Genki Girl
- Image Song: "Otome Gokoro to Sora no Hoshi" ("A Maiden's Heart and the Sky's Stars")
- Lethal Chef: Never, never, ever, ever have her or her sister cook for you. Unless you have an iron stomach, you will regret it!!
- Love Makes You Crazy: Besides ghosts, Rein loves cute boys and playing matchmaker.
- Magical Incantation: "Twinkle Bloomish!" in the first series and "Ralalila!" in Gyu!
- Nightmare Fetishist: Rein really loves ghosts and scary things.
- Official Couple: With her beloved Bright-sama.
- Princess Curls: When transformed.
- Red Oni, Blue Oni: The Blue to Fine's Red. She is literally Color-Coded for Your Convenience!
- Regal Ringlets
- Sibling Team
- Single Girl Seeks Most Popular Guy
- Spell My Name with an "S": Rein's name was written as "Rain" in the first eyecatch of the series, but producer Junichi Sato decided to stick with calling her "Rein" because he didn't want her to be associated with the weather rain.
- This Loser Is You
- Tomboy and Girly Girl: Rein is the Girly Girl to Fine's Tomboy.
- You Gotta Have Blue Hair: Rein actually does have blue hair.
Voiced by: Satomi KoorogiPoomo is a fairy sent by Princess Grace to train Fine and Rein to inherit her powers.
- Deadpan Snarker: His exasperation with Rein and Fine's un-princesslike tendencies causes him to lapse into this, particularly during the early part of Season 1.
- Fair-Weather Mentor
- Heroic Sacrifice: Poomo sacrifices himself when Fine and Rein are forced to use their incomplete set of Grace Stones against the Black Crystal despite not finding the Sunny Kingdom's Grace Stone... but he comes back since the Grace Stone is found at the last minute.
- Image Song: "Poomo Poomo March de Poomo!"
- Mentor Mascot
- Non-Human Sidekick: He's a fairy about as big as a human hand with pointed ears and a tail.
- Supreme Chef: He has shown himself a capable chef to the point where people would start drooling if they ever got to eat his cooking. He would have to be this skilled since his charges are Lethal Chefs...
- Team Pet: Was against it at first, but later just rolled with it.
- Verbal Tic: He ends all of his sentences with "de pumo."
CamelotFine and Rein's Old Retainer. She follows them around from time to time to keep a watch on them. Other times, she scolds them for not being "proper princesses".
- *Crack!* "Oh, My Back!": Happens from time to time due to her age.
- Old Retainer
- Paper-Thin Disguise: She and Lulu are very obviously the Helper Camens. Doesn't stop them from helping the girls later in the series.
King Truth and Queen ElsaThe King and Queen of the sunny Kingdom. they were aware of the weakening of the Blessing of the Sun since the very beginning.
Princess GraceThe legendary princess who once stopped the sun of the Wonder Planet from extinguishing and has now enlisted Fine and Rein to do the same.
Voiced by: Misato FukuenLione is the princess of the Meramera (Flame) Kingdom. She's very reserved, kind-hearted, and is talented at dancing.
- Cat Girl: Her father is an anthropomorphic lion, so this is a given. Her cat-like ears and Cute Little Fangs seal this deal.
- Curtains Match the Window: She has orange hair and similarly-colored eyes.
- Cute Little Fangs: She has one that tends to refuse to hide.
- Demoted to Extra: Lione seemed like she would be part of the main cast from her appearance since she's the first princess Fine and Rein befriend and she was one of the few who received an Image Song. By the middle of the series, she started appearing infrequently and is even grouped with Sophie and Milro.
- Image Song: "Brand New Day"
- Meaningful Name: Her father is an anthropomorphic lion, so it would make sense that she was named after lions.
- Peacock Girl: Lione dons peacock feathers in her samba costume.
- Proper Lady
- Psychic Link: Has an empathic one with the Bo Dragon. This lets her interpret his words and sense his feelings.
- Shrinking Violet: Though not as much as Milro, Lione is still a little shy.
- Unusual Ears: She has the ears of a lion that she inherited from her father.
Voiced by: Vanilla Yamazaki (first series episodes 1-25), Shihomi Mizowaki (first series episodes 27-end, Gyu!)Tio is the prince of the Meramera Kingdom and Lione's younger brother. He swore on his life to protect Fine and Rein, but he hasn't exactly done that yet. Later, he becomes Shade's self-appointed apprentice to learn his ways.
- Ascended Extra: In the second half of the first series, Tio decides to follow Shade's footsteps and accompanies him on his journey.
- Badass Longcoat: Sure, Tio gets a trenchcoat in the second half of the first series, but he's still not as badass as Shade.
- Butt Monkey: In almost all of his appearances during the first half of the first series, something always goes wrong so much that it becomes a Running Gag. He gets better... sort of.
- Cat Boy
- Cross-Dressing Voices
- Cute Little Fangs
- I Just Want to Be Badass: Tio admires Shade for his badassery, but isn't quite up to his level even when he begins to become his apprentice.
- Iron Butt Monkey: He has been slammed and thrown around repeatedly, and he's been launched into the sky more time that anyone would care to count. All this, and he still keeps coming. He's quite resilient for a little guy...
- Leitmotif: "Yaa Yaa Wagakoso Prince Tio" is a definite indicator of Tio's Once per Episode moment.
- Once per Episode: Tio tries hard to help Fine and Rein in every single episode during the first half of the first series, but something always goes wrong. Some of his encounters result in A Twinkle in the Sky.
- Stalker Without A Crush: Pursued Shade in the second half of the first series to be his apprentice.
- Took a Level in Badass: In episode 32 of the first series, Tio manages to save the Samba Festival.
- Unexplained Recovery: How is he able to survive all of his backfired attempts?
- Unusual Ears: He has the ears of a lion that he inherited from his father.
King Wohl and Queen NinaThe King and Queen of the Flame Kingdom. They oversee the stone that uses the Blessing of the Sun's power to warm the Wonder Planet.
- Character Tic: Wohl tends to smash his fists together and say a short phrase three times in his biggest Ham and Cheese when he gets fired up.
- Curtains Match the Window: Nina has orange hair and eyes, just like Lione.
- Hot-Blooded: Wohl, fitting for the king of a kingdom based on fire.
- Large Ham: Wohl, as per his Hot-Blooded-ness.
- Rated M for Manly: King Wohl is extremely masculine and he is not afraid to pound his fists together when he gets fired up.
Bo DragonA massive dragon living inside a volcano near the Meramera Kingdom. He has a connection with Lione that allows her to interpret his words.
- Caustic Critic: Has seen just about every attempt to be hilarious and is not really amused by it anymore.
- Instant Awesome, Just Add Dragons
- Our Dragons Are Different
- Psychic Link: Has an empathic one with Lione.
- Put on a Bus: Doesn't appear in Gyu!, surprisingly enough.
- Twitchy Eye: When he gets frustrated at everyone's attempts at comedy.
Voiced by: Kaori MizuhashiAltezza is the haughty princess of the Jewelry Kingdom who initially dislikes Fine and Rein on-spot. She's boastful and arrogant, but shows her more introspective sensitive side when it comes to her older brother, Bright, whom she looks up to.
- Alpha Bitch: Altezza is the princess version of this before she gets better.
- Ascended Extra: Altezza was nothing more than the Alpha Bitch in the beginning of the series, but during the second half, she accompanies Fine and Rein on their journey and even gets a costume upgrade.
- Big Brother Worship: Altezza admires Bright greatly to the point that sometimes she gets annoyed when his attention is focused on someone else. This also causes her to be distressed during the second half of the show when Bright succumbs to The Dark Side.
- Bratty Half-Pint
- Break the Haughty
- Clingy Jealous Girl: Don't come between her and her big brother now!
- Depending on the Writer: Altezza and Milro seemed to have switched personalities in the manga adaptation due to the artist's Alternate Character Interpretation.
- Hair Decorations
- Hard Work Hardly Works: She trained extensively for each Princess Party only to not win a single one until the end.
- Hey, You!: Initially, Altezza addresses anyone who isn't Bright as "you."
- Noblewoman's Laugh
- Official Couple: Altezza shows no interest in Auler in the beginning of the show, but by the end, she returns his feelings after he cheers her up during Bright's Face–Heel Turn.
- Sibling Team: Altezza likes to team up with Bright, especially during dances.
- Sibling Yin-Yang: While Altezza is rude to Fine and Rein at first, Bright is gentle and friendly.
- Spell My Name with an "S": Before the character fanbook was released with official English romanizations, the fansubs spelled Altezza's name as "Altessa."
- "Stop Having Fun" Guy: More like "Stop Having Fun" Girl, but same principle. She competes in the Princess Parties for the sole purpose of winning and tends to shun others who just want to have fun.
- Tsundere: She may have an icy and arrogant demeanor, but she quickly reveals that she is capable of compassion and good conduct.
Voiced by: Tetsuya KakiharaBright is the prince of the Jewelry Kingdom and is known as the no. 1 idol in the Wonder Planet. He's patient and somewhat of a pacifist, and despite that all the girls adore him, he loves Fine out of them all. This makes him feel threatened when Fine starts hanging around Eclipse...
- Beware the Nice Ones: He may be an all-around Nice Guy Prince Charming, but he doesn't take personal insults or being deceived lightly. Becomes much more of this after his Face–Heel Turn.
- Bishōnen: Complete with Love Bubbles and Bishie Sparkle.
- Brainwashed and Crazy:
- More Than Mind Control or not, he was still possessed by the Black Crystal and made into its pawn against his will.
- He applies this against the Queen of Drop Kingdom after giving her a device powered by dark magic that would give Drop Kingdom complete control of the rain cycle. He completes it by convincing her that she could force the other kingdoms to pay tribute for rain.
- He even tries to use the power of darkness to force Fine to be the girl he envisioned her as and turn her to his side.
- Chick Magnet
- Double Entendre: Bright does a rather... inappropriate dance at the Samba Festival to rein in a crowd. Does This Remind You of Anything?
- Evil Costume Switch: This happens some time after he is possessed by the Black Crystal. His clothing trades its white coloration with black and his Cool Crown eventually comes with a piece of the Black Crystal itself.
- Face–Heel Turn: Bright becomes Brainwashed by The Dark Side halfway throughout the first series.
- Fallen Hero: Becomes this after his Face–Heel Turn.
- Harmless Villain: Okay, who gave Bright the Idiot Ball when he wanted to take over the Drop Kingdom by pissing its queen off? He becomes a Not-So-Harmless Villain after he's fully given his Black Prominence powers and especially after his Despair Event Horizon, which strengthens the power of the Black Crystal.
- "I Know You're in There Somewhere" Fight: Confrontations of this lead to Fighting from the Inside.
- Late-Arrival Spoiler: Yes, Bright becomes evil. The cover for vol. 8 of the home release even shows him in his new costume.
- Let's Get Dangerous!: This happens when Bright completely inherits all of his Black Prominence powers.
- The Load: Most of the time, he contributes almost nothing when he gets involved. This plays a role in his Face–Heel Turn.
- Love Makes You Crazy: When Bright realizes that Fine wasn't who he thought she would be, things take a turn for the worse due to his already-crumbling emotional state.
- Manipulative Bastard: Several counts:
- He manages to incite infighting amoung the kingdoms by exploiting existing rivalries.
- He convinces the Queen of Drop Kingdom to start charging other kingdoms for rain after he gives her a device to completely control the Wonder Planet's rain cycle.
- He tops this off by convincing every other kingdom to recognize him as the supreme ruler of the Wonder Planet, either through deciet or by stealing the seals used for official documents.
- More Than Mind Control: Bright actually thinks Taking Over The Wonder Planet is right because then he would be able to use his power to make people happy.
- Mundane Utility: Use the Warriors of Darkness to...decorate a room and set up a party that everyone (particularly Fine) is invited to. Boomo calls him on this.
- My God, What Have I Done?: Towards the end of Bright's evil rampage, he does this when he realizes everyone has deserted him, including Boomo.
- Nice Guy: His main goal in life seems to be trying to protect and make others happy. This gets exploited by the darkness.
- Official Couple: Bright did have feelings for Fine at first, but eventually reciprocates Rein's crush on him.
- Prince Charming: Bright is well-loved among the ladies of the Wonder Planet.
- Screw the Rules, I Make Them!: A very interesting and surprisingly well-meaning case. After conning his way into becoming king of the Wonder Planet, he actively starts interfering in Princess Parties. The first time, he tries to get Altezza declared the winner despite her statue not being the actual best one. Then, he uses his authority to declare Fine the winner of the last Princess Party. Both times fail because 1) Altezza willingly turned down the victory, and 2) Fine gave the win to Altezza since neither she nor Rein could dance well and Altezza did the best of them all.
- Sibling Yin-Yang: He is a Nice Guy who wants to make everyone happy while Altezza is a Tsundere who bottles her emotions.
- Weapon of Choice: Bright uses a Cool Sword, but later trades it in for an oddly shaped Battle Boomerang during his Face–Heel Turn.
- Wide-Eyed Idealist: Believed the world can be always be happy. He was proven wrong despite the world itself being a Sugar Bowl and fell into despair as a result. This made him easy prey for the darkness.
King Aaron and Queen CameliaThe King and Queen of the Jewelry Kingdom.
- Noblewoman's Laugh: Camelia. It would appear Altezza inherited it from her.
Voiced by: Junko MinagawaShade is the prince of the Moon Kingdom, but masquerades under a secret alias known as "Eclipse." He prefers to carry out his plans in the shadows and becomes somewhat protective over Rein when she is in danger.
- All Girls Want Bad Boys
- Badass Longcoat
- Badass Normal: That one fight scene in episode 26 really shows how badass he can be.
- Big Brother Instinct: Not only is Shade protective of his mom, but he's also fond of Milky. Official profiles state that he is sweet to Milky and likes spoiling her.
- Big Brother Mentor: Shade becomes this to Tio in the second half of the first series, though it was more like Tio following him without his permission.
- Bishōnen: Rein even pictures him in Love Bubbles and a Bishie Sparkle once. He's also apparently popular with the maids in the Sunny Kingdom in the manga.
- Chick Magnet
- Code Name: Shade goes under the name "Eclipse" when he's out of the palace in his trenchcoat guise until the second half of the series when Fine and Rein realize who he is. This trope is disregarded in the manga, where "Eclipse" is really his name.
- Cross-Dressing Voices: Junko Minagawa does a believable portrayal of him, since he does sound like an actual prepubescent boy and his voice is deeper than Tetsuya Kakihara (Bright) and Hiro Shimono (Auler), who are both males themselves, but this only gets hilarious when you realize she can't exactly hit the low notes in the Christmas Album.
- Jerk with a Heart of Gold: He's not very kind to Fine and Rein at first as Eclipse, but once they find out his intentions, he becomes kinder to them.
- Late-Arrival Spoiler: Yes, Eclipse is Shade.
- Leitmotif: "Teki ka? Mikata ka?! Nazo no Eclipse" always plays during Eclipse's appearances, especially in the first half of the first series.
- Official Couple: With Fine.
- Paper-Thin Disguise: Look at Shade. Now look at Eclipse. Nice job disguising yourself.
- The Rival: Bright viewed Eclipse as this before Shade revealed his identity.
- Secret Identity
- Weapon of Choice: Sure, he knows how to use a Cool Sword, but he prefers to Whip It Good.
- You Gotta Have Blue Hair
Voiced by: Kazuko KojimaMilky is the infant princess of the Moon Kingdom. She loves eating sweets and her older brother, Shade, a lot.
- Big Eater
- Morality Pet: To Prince Shade. He loves spoiling her.
- Intelligible Unintelligible: She may be unable to speak properly, but everyone seems capable of understanding her just fine.
- The Unintelligible: She can only say "babu" in varying patterns. Doesn't stop the other characters from understanding her though.
Roman and his HenchmenRoman is the Evil Chancellor of the Moon Kingdom who seeks to rule the Wonder Planet. His Henchmen are his loyal Mooks who display surprising competence.
- Batman Gambit: The Henchmen pull several in their Team Rocket Wins episode, among others. First, they know Bright is suspicious of Eclipse and use that to lure him into a trap. Next, they kidnap Milky because by then they know Shade is Eclipse and thus will keep him distracted for a while. Then, they put Fie and Rein into a position where they have no choice but to use the Prominence...while having the machine that can steal it at the ready. Finally, they send Bright into a Bottomless Pit as another distraction for Shade. And that's not even getting into the other gambits they've used throughout the earlier episodes...
- Benevolent Boss: Implied. Roman's henchmen were overjoyed to see him return after the Black Crystal is defeated and banished.
- Big Bad Wannabe: Roman is the main antagonist of the first part of the first season. The "Wannabe" part comes from when the Black Crystal decides to absorb him due to regarding him as useless now that Bright has the Black Prominence.
- Creepy Crossdresser: The second time he tries to use the stolen Prominence, it gives him a darker version of Fine and Rein's dress, at everyone's bewilderment.
- Disney Death: He is brought back after the Black Crystal is defeated, much to his Mooks' joy. Not that he deserves it, of course.
- Dropped a Bridge on Him: See You Have Outlived Your Usefulness below.
- Evil Chancellor
- Evil Is Not a Toy: Roman underestimates the Black Crystal. Badly.
- Hostage for MacGuffin: They threaten Bright's life to goad Fine and Rein into using the Prominence. Subverted in that they still use Bright as a means of distracting Shade and successfully escaping with the stolen Prominence.
- Karma Houdini: The most the henchmen ever suffer is humiliation whenever they fail to get the Prominence. Once they succeed, they stop intervening as much, but their more heinous crimes go unpunished. Very much averted with Roman.
- Malevolent Masked Men: The Henchmen. Never once do we get to see their faces other than their eyes and some of their skin; the rest is hidden by a hooded robe and mask.
- Manipulative Bastard: He and his Mooks have been responsible for a lot of trouble all over the Wonder Planet.
- Princess Curls: Twice, when Roman tries to use the stolen Prominence much to everyone's bewilderment.
- Take Over the World: Roman's main goal. He doesn't succeed and is absorbed into the Power of Darkness when he's outlived his usefulness.
- Team Rocket Wins: After several episodes of trying and failing, Roman and his Henchmen hatch a plot to finally take the Prominence. One Henchman disguises himself as Shade and lures Bright into a trap so as to use him as bait for Fine and Rein. Another kidnaps Milky to distract Shade until it's too late. The rest hold Bright hostage and use a machine to suck out the Prominence when they force the girls to use it to save Bright. It works splendidly despite Shade showing up to stop them.
- Those Two Bad Guys: Most of the time, we only ever see two of Roman's Henchmen.
- Would Hurt a Child: The henchmen have no qualms over harming the girls or using their friends as bargaining chips. Case in point: They threaten the girls with Bright's life after luring him into a trap, they kidnapped Milky to lure Shade away, and they throw Bright into a Bottomless Pit just to distract Shade and let them get away.
- You Have Outlived Your Usefulness: Once he gives the Black Prominence to Bright, the Power of Darkness sucks him into the chest that held Boomo. Boomo all but says this trope when it happens.
Voiced by: Sachi SukigaraMilro is the shy, artistic princess of the Drop Kingdom.
- Adaptational Villainy: Milro becomes the closest thing to a minor villain in the manga adaptation.
- Demoted to Extra: Not that she was part of the main ensemble from the beginning, but she suspiciously doesn't show up very much in Gyu!
- Depending on the Writer: Milro is a Shrinking Violet in the anime, but the manga makes her into an Alpha Bitch with a Noblewoman's Laugh.
- Alpha Bitch: Milro was this and The Ojou with a Noblewoman's Laugh in the manga adaptation due to the manga artist's Alternative Character Interpretation of her.
- An Ice Person: In the manga, Milro has ice powers.
- Ice Queen: Milro was this in the manga and even had ice powers!
- Rich Bitch: Milro's just as snotty as she is wealthy.
- The Rival: Milro was Fine and Rein's main antagonist at the Princess Parties.
- Screw the Rules, I Have Money!: Milro gets away with her shenanigans because she's an affluent princess.
- Screw the Rules, I Have Supernatural Powers!: She freezes up Sunny Kingdom's ballroom (or in her own words, "decorates") because she can, even though she's a guest.
- Screw the Rules, I'm Beautiful!: Subverted. Milro tries to justify her place at the top by making claims to her beauty, but neither Fine nor Rein buy into her BS.
- Vanity Is Feminine: Milro often brags about her beauty, and is the only character (who also happens to be female) to do so. Part of why she thinks she should win the Princess Parties is simply because she's beautiful.
- What Happened to the Mouse?: In the manga, Milro stops appearing after chapter 3 and her rivalry with Fine and Rein was dropped for some reason. She doesn't appear even in the rest of the Princess Parties.
- Put on a Bus: In the manga.
- Shrinking Violet: In the anime
- Spell My Name with an "S": Confusion has been abound as to how exactly Milro's name is spelled. In a letter in episode 19 of the first series and the second character fanbook, her name was romanized as "Milro." The first fanbook spelled it as "Mirlo", but it seems to have been a mispelling. The fansubs romanize her name via the Japanese pronunciation, "Miruro." It's commonly accepted that "Milro" is the right spelling and "Mirlo" was just an error that was subsequently corrected in the second fanbook.
- Unusual Ears: Milro has bear ears in the anime and ice crystals for ears in the manga.
Voiced by: Rina SatoSophie is the airheaded princess of the Windmill Kingdom.
- Comically Missing the Point
- The Ditz: Count the number of times she acts quirky.
- Innocently Insensitive: Her statements toward Altezza being in the "loser club" with her are well meaning, but Altezza's anger in response is rather justified.
- Unusual Ears
- You Shall Not Pass: She put herself in between a swarm of locusts and Altezza's roses in order to protect them during the Best Flower Princess Party, getting crowned best princess as a result. She's concerned about it now that she's no longer in the loser club with Altezza.
Voiced by: Hiro ShimonoAuler is the prince of the Windmill Kingdom and is deeply besotted with Altezza.
- Ascended Extra: Auler gets a larger role near the end of the first series due to Character Development with Altezza. Unfortunately, by Gyu!, he was Demoted Back to Extra.
- Dogged Nice Guy: Not because of the Unusual Ears, of course!
- Hopeless Suitor: Until the end of the first series.
- Official Couple: Auler has always liked Altezza, and fortunately, they get together at the end of the first series.
- Put on a Bus
- The Rival: Auler and Bright initially saw each other as this due to the rivalry between the Jewelry and Windmill Kingdoms.
- Unusual Ears
Seed PrincessesThe princesses of the Seed Kingdom consist of the eleven sisters Ichele, Harney, Gorchel, Nina, Saya, Shiyon, Loloa, Nursya, Quarry, Julia, and Joiner.
BoomoBoomo is a fallen fairy and the mentor to Bright after his Face–Heel Turn. He is about as prone to Amusing Injuries as his Good Counterpart, Poomo.
- Brainwashed: Used the power of darkness to apply this to Bright and finalize his Face–Heel Turn.
- Butt Monkey: He's as prone to Amusing Injuries as his counterpart, Poomo!
- The Corrupter: He is the one who goads Bright into doing the terrible things he did while possessed by the Black Crystal.
- Deadpan Snarker: He and Poomo could exchange lots of stories about how difficult it is to work with their respective charges.
- Evil Counterpart: To Poomo.
- Evil Laugh: Comprised of his own name.
- Evil Mentor: Is this toward Bright.
- The Fair Folk: He is a fairy, but he's very clearly malevolent.
- Heel–Face Turn: Has one thanks to his crush on Princess Pearl. He does remain standoffish, however.
- It's All About Me: He believed that he should've been the king of the Poomo Fairies. This attracted the darkness to him and forced Princess Grace to seal him away along with the darkness.
- Love Redeems: His crush on Princess Pearl eventually frees him from the Black Crystal's influence.
- Non-Human Sidekick.
- Sealed Evil in a Can: He was sealed inside a chest along with the darkness before Roman and his mooks released him.
- Verbal Tic: He ends all of his sentences with "de bumo", further marking him as Poomo's counterpart.
- Villain Teleportation: Like Poomo, he has the ability to teleport. However, he seems able to use it at will and typically utilizes it to make a hasty retreat alongside Bright.
- You Have Outlived Your Usefulness: References this trope after Roman is absorbed by the darkness.
Royal Wonder Academy
Voiced by: Emiri KatouChiffon is the six-year-old Child Prodigy princess of the Mathematics Planet and is also the president of the student council. She quickly befriends Fine and Rein when they enter the Royal Wonder Academy and teams up with them to form Team Gemini. Since she is used to the strict school policities working against teamwork, she becomes interested in the twins' methods and the concept of friendship.
- Catch Phrase: "Mysterious, mysterious! So mysterious!"
- Child Prodigy
- Expressive Hair: Her hair wiggles everytime she finishes a calculation.
- Super Intelligence
- What Is This Thing You Call Friendship?
Voiced by: Shinnosuke TachibanaThomas is the former prince of the Walpurgis Planet and is the vice president of the student council.
- The Atoner: After his Heel–Face Turn, he seeks to make up for all the wrongs he did while Brainwashed.
- Brainwashed: Much of his actions weren't truly his own.
- Catch Phrase: "There's no need [for (insert name here)] in this academy!"
- Demoted to Extra
- Fallen Prince: Thomas was originally the prince of the Walpurgis Planet until his friends betrayed him, leading to him becoming Brainwashed.
- Four Eyes, Zero Soul: Before his Heel–Face Turn. He caused a lot of trouble for Royal Wonder Academy while he was Brainwashed. He sometimes seemed to enjoy the wrongs.
- Heel–Face Turn: Once he is freed from his brainwashing, he turns good...and is Demoted to Extra!
- Late-Arrival Spoiler: The leaked character designs for Gyu! outright says that Thomas was the former prince of the Walpurgis Planet. This was a huge part of his backstory and why he was the villian for the first arc of the show.
- Megane: He wears glasses. Enough said.
- Must Make Amends: He drops out of school to work at a hotel to make up for what he did in the academy.
- Put on a Bus: Once his arc was over, he boards a bus for 20 or so episodes.
- Stoic Spectacles: His glasses give him an air of seriousness. He still retains his stoicism post-Heel–Face Turn.
- Catch Phrase: Count how many times she says "yoki ni hakarae" ("If you'd please") to everything.
- Official Couple: With Fango.
- Red Herring: A lot of people assumed that given Elizabeta's rich status, she would become the new Alpha Bitch in Gyu! She shows her true colors the moment she opens her mouth.
- Spoiled Sweet
- Vocal Dissonance
Shasha & Carla
Black Planet Academy
Voiced by: Yuri ShiratoriBibin is a student of the Black Planet Academy and wishes to be crowned as its queen someday. She works with Ed-chin under the orders of the principal to ruin their rival school, the Royal Wonder Academy.
- Black Magician Girl
- Dark Chick
- Dark is Not Evil: Bibin's just doing what she's told to do.
- Genki Girl
- Heel–Face Turn: Toward the end of Gyu! when she aids in bringing down the Black Crystal King.
- Magical Incantation: Bibin has two. When she sprouts Unhappy Seeds, she chants, "Unhappy Seed, become unhappy!" Her normal attack-based incantation is "Bibin Fruits."
- Squishy Wizard