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- Celibate Hero: 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.
- 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.
- Money Fetish: His greed usually pushes him into schemes which backfire spectacularly, such as in "Eizan's Shadow".
- Defrosting Ice Queen: Zinkia's character bios indicate that Ami would have become this had the series continued past Season 1.
- Gonk: Especally when he yells.
- The Stoic: No matter what mood he's in, he'll always talk in the same tone of voice.
- 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.
- Younger Than They Look: He's significantly taller than his peers and sports a voice fitting for a teenage character. He's eleven.
- 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.
- Not So Different: Like his rival Jimmy B., Bruce is more reckless and mischievous than his teammates, although his intentions are not so harmless.
- Pet the Dog: It's revealed in "Super Ninja" that he sleeps with a teddy bear.
The Kimura Twins
- Coordinated Clothes: There are some variations between the characters' uniforms, but the twins' uniforms are exactly the same.
- 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".
- 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
- 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.
- 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 being a complete terror to the kids of both Shuriken and Katana, yet he suffers no repercussions.