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Shuriken School
Eizan Kaburagi
Voiced by: Nathan Kress, Hélène Bizot (French dub), Megumi Matsumoto (Japanese dub)
Our main character.
- The Ace: Reputedly the best student at Shuriken School.
- Does Not Like Spam: Eizan cannot even look at an onigiri without gagging, owing to the fact that his father runs an onigiri stand and cooks nothing but.
- Performance Anxiety: When he's picked out as the male lead in the school play, much to his mortification.
Okuni Dohan
Voiced by: Jessica DiCicco, Emilie Rault (French dub), Kei Kobayashi (Japanese dub)
One of Eizan's best friends.
- Brainy Brunette: Okuni has brown hair and is very studious, to the point where she's something of a Hermione Granger expy.
- Celibate Heroine: The very thought of someone being in love with her causes her to lash out angrily. Her aversion is fueled by the belief that love gets in the way of her ninjitsu studies.
- Farmer's Daughter: She comes from a small fishing village.
- Named After Somebody Famous: Okuni is named after Izumo no Okuni, a legendary dancer and shrine maiden credited with having invented the art of kabuki.
- She Cleans Up Nicely: Her kimono ensemble in "The Big Illusion" caused many of her male peers to become enamored with her, those including Choki, Nobunaga, Daisuke, and even one of the Kimura Twins.
- Ship Tease: With Eizan. In fact, there's a whole episode dedicated to it.
- Tomboy and Girly Girl: The tomboy to Ami's girly girl.
Jimmy B
Voiced by: Kimberly Brooks, Sophie Arthuys (French dub), Makoto Tsumura (Japanese dub)
The second of Eizan's best friends.
- Noodle Incident: Whatever Jimmy could have done to get himself expelled from Katana is anyone's guess.
- Real Men Wear Pink: In one episode, he isn't afraid to admit that he reads women's magazines.
- Red Oni, Blue Oni: Jimmy is the hotheaded red to Eizan's calmer blue.
- Shipper on Deck: Shows signs of being one for Eizan/Okuni in "The Saber and its Shadow". He attempts to push Eizan into talking to Okuni when the two start avoiding each other, and lightly teases them about saving the school using The Power of Love to defeat a machine.Jimmy: Love, the only weapon that no machine will ever be able to defeat.
The Principal
Voiced by: Charlie Adler, Pierre Baton (French dub), Jin Urayama (Japanese dub)
- Cloudcuckoolander: He has his excentricities, mainly related to the school's funds. One such occasion has him talking to a nice big cheque as though it were a person.
- Everyone Calls Him "Barkeep": He's just "the Principal".
- Money Fetish: His greed usually pushes him into schemes which backfire spectacularly, such as in "Eizan's Shadow". The end of that episode even has him treat the cheque like a person, asking to speak with it during a phone call.
- Miniature Senior Citizens: Despite being an adult and headmaster of the school, he's comically tiny.
- Right for the Wrong Reasons: In one episode, the Principal correctly guesses that Otomo has been lying about training with the legendary master Yamada and is going to have his elderly father pose as him; this unfortunately leads the Principal to attack the real master Yamada and promptly get his ass kicked.
Ami Saeki
Voiced by: Jessica DiCicco, Patricia Legrand (French dub), Chie Sawaguchi (Japanese dub)
- Defrosting Ice Queen: Zinkia's character bios indicate that Ami would have become this had the series continued past Season 1.
- Everyone Loves Blondes: Ami has blonde hair and is a bit of a Dude Magnet. She can even be seen walloping a Katana boy in the opening credits as he's leaning in for a kiss.
- Shipper on Deck: Ami ships Eizan/Okuni, and even tries to give Okuni some romantic advice.
- Tomboy and Girly Girl: She's the Girly Girl to Okuni's Tomboy.
Jacques Morimura
Voiced by: Nathan Kress, Isabelle Volpe (French dub)
A young boy who accidentally enrolled himself in Shuriken School, due to mistaking their uniform for the scuba-diving school's.
- Named After Somebody Famous: He's possibly named after Jacques Cousteau, inventor of the Aqua-Lung.
Pig/Pork
Voiced by: Billy West (uncredited)
An anthropomorphic pig, and the most mysterious student in Shuriken School.
- Evil-Detecting Dog: Or pig, in this case; he's able to see through the chick's facade in "Funny Chick", and was the first to correctly deduce that the rampaging demon in "The Demon and Mrs. Clean" was a possessed Mrs. Clean.
- The Voiceless: Apart from a grunt in "An XXL Lie", he doesn't make a single sound.
Vladimir Keitawa
Voiced by: Charlie Adler, Bruno Magne (French dub)
- Gonk: Especally when he yells.
- Husky Russkie: Vlad is very, very Russian.
- Overly Long Name: His middle name is allegedly long and difficult to pronounce.
Kubo Utamaro
Voiced by: Maurice LaMarche, Denis Laustriat (French dub), Ryūsaku Chiziwa (Japanese dub)
- Amazon Chaser: It is hinted at that Kubo has a crush on his coworker Kita.
- The Bore: Is considered this by the students, who can barely stay awake during his classes.
- The Stoic: No matter what mood he's in, he'll always talk in the same tone of voice.
- Tiny Guy, Huge Girl: His crush Kita is at least a head taller than him.
Kita Shunai
Voiced by: Jessica DiCicco, Ariane Aggiage (French dub), Hana Takeda (Japanese dub)
- Lady of War: Arguably the most formidable teacher at Shuriken and very precise and beautiful. It gets even better when you find out she used to teach at Katana!
- The Smurfette Principle: She's the only female teacher at Shuriken.
- Tiny Guy, Huge Girl: Kita positively dwarfs Kubo when she stands next to him.
Katana School
Naginata
Voiced by: Maurice LaMarche, Jean-Claude Donda (French dub)
- Black Magic: His character bio states that he's highly skilled at the dark arts, although he's never exhibited this talent onscreen.
- Goofy Print Underwear: of the classic boxer-with-heart-print variety, according to "Dirty Rice Balls".
- Looks Like Cesare / Creepy Shadowed Undereyes: Zinkia's character bio describes him as having a "thin, pale appearance" and "dark circles under his eyes, which make him look rather sinister."
- The Leader: of the Mastermind variety.
- The Rival: To Eizan, specifically.
- Younger Than They Look: He's significantly taller than his peers and sports a voice fitting for a teenage character. He's eleven.
Bruce Chang
Voiced by: Kimberly Brooks, Benjamin Pascal (French dub)
- Character Tic: Bruce can be spotted hunched over and grinding his teeth in anticipation of the fight in "Kubo's Secret".
- Losing a Shoe in the Struggle: In "Old School Ninjitsu", Jimmy hits him so hard during the diner fight that his shoes fly off.
- Pet the Dog: It's revealed in "Super Ninja" that he sleeps with a teddy bear.
The Kimura Twins
Voiced by: Jessica DiCicco, Brigitte Lecordier (French dub)
- Coordinated Clothes: There are some variations between the characters' uniforms, but the twins' uniforms are exactly the same.
- The Dividual: They rarely if ever appear separately, and are not even referred to by their individual names.
- He-Man Woman Hater: Pretty much the reason why they specifically have it out for Okuni.
- Pet the Dog: It's implied in "The Big Illusion" that one twin might actually harbor a crush on Okuni, their nemesis.
- Also, in the same episode, they are visibly moved to tears by Pig's violin-playing.
- Single-Minded Twins: To the point where their first names are never mentioned. They're simply referred to as the collective "Kimura Twins".
- The Sneaky Guy: They're sent to spy on Shuriken School on various occasions, such as in "The Winning Ninja" and "The Big Illusion".
Doku
Voiced by: Billy West (uncredited)
- Even Bad Men Love Their Mamas: According to his bio, his mom still brings him lunch every day.
- The Quiet One: Despite having no speaking lines, he seems to have no problems being included in Naginata's schemes.
The Principal of Katana School
Voiced by: Charlie Adler, Pascal Massix (French dub)
- Drill Sergeant Nasty: is this to the Katana students. Ventures into Fridge Horror territory when his behavior comes off as abusive rather than comedic, since he makes the boys do push-ups until they pass out ("Cherry on the Cake"), and it's implied that he uses a flail to punish Naginata in "Funny Chick".
- Hair-Trigger Temper: to the point where the Katana students (sans Naginata) shake when they talk to him.
- Older Than They Look: He appears as a feudal warlord in a few flashbacks during the movie. These flashbacks are set centuries before the time of the narrative.
- Pet the Dog: The only person he seems to genuinely care for is his pet ninja chick.
Others
Kazumi
Voiced by: Nathalie Bienaimé (French dub)
- Chuck Cunningham Syndrome: He only had one appearance and he also serves as one of the show's primary antagonists.
- Elephant in the Living Room: Nobody but Eizan's two friends and The principal and Katana School notices him.
- My Dad Can Beat Up Your Dad: Will often make threats relating to his father's wealth when upset.
- Screw the Rules, I Have Money!: The core of his entire character. He spends the episode making an utter nuisance of himself to the kids of both Shuriken and Katana, yet he suffers no repercussions.
- Spoiled Brat: His defining trait.
Grand Master Otomo
- Jabba Table Manners: Watching him eat is... painful.
- Remember the New Guy?: Otomo appears in exactly one episode and is never mentioned prior or ever again, and one can infer that he most likely is a Shuriken alumnus.
