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Played by: Leo Howard
- Broken Ace: He can't dance or throw a football.
- Arch-Enemy: Though he only appeared for two episodes, his cousin Kai. The only reason Kai joined the Black Dragons was because they were the mortal enemies of the Wasabi Warriors, and that was a good enough reason for him. That being said, it's mainly by default because Kai is one of the few martial artists on the show capable of matching Jack, and the only one with the personal enmity to really count as an Arch-Enemy.
- Catchphrase: Whenever Jack catches a punch in his palm, he'll say some variation of "You probably shouldn't have done that".
- Crazy Jealous Guy: Towards Kim, whenever she has a boyfriend.
- Does Not Like Spam: The very smell of blue cheese makes him nauseous.
- Face–Heel Turn: Averted. Jack joined and represented the Black Dragons for a tournament, but he returns to the Wasabi Warriors at the end of the episode.
- Heir to the Dojo: His grandfather trained Bobby Wasabi, making Jack a textbook example of the Western variant mentioned on the trope page.
- Mr. Fanservice: Leo Howard has a lot of fangirls.
- Official Couple: With Kim, as of "Kickin' It on Our Own". Even more official from "Two Dates and a Funeral".
- Sympathy for the Devil: Gives this towards Frank in "Jack Stands Alone", especially after seeing him as an emotional wreck at Falafel Phil's.
- Taking the Bullet: Did this for Kim in the episode The Wrath of Swan, but it didn't do much good, because Kim still ended up messy anyway.
- Took a Level in Dumbass: In Season 1, Jack was not only the most skilled student in the dojo, but he was usually the one who would come up with a plan to the gang's current situation. In Season 2's "The Chosen One", Jack was more concerned about his hair being shaved than saving the Grandmaster Monk. In "Wedding Crashers", Jack picks up one of Bobby's movie props and accidentally shoots Jerry in the mouth paralyzing him.
- Vocal Evolution: As the show went on and Leo Howard got older, his voice began to deepen. If one to were watch a Season 1 episode and then a Season 4 episode, the dissonance becomes more pronounced.
- Young and In Charge: As of Dueling Dojos, Jack has the rank of a Sensei, and has the authority to teach and recruit potential students.
Played by: Dylan Riley Snyder
- Adorkable: Particularly with the third-season hairstyle and wardrobe tweaks to make his buttoned-up style a little less Urkel and a little more One Direction.
- Ambiguously Jewish: Although "Meet The McKrupnicks" reveals his heritage as Scottish (on his father's side) despite the Eastern European-sounding name.
- Actually confirmed "How Bobby Got His Groove Back."
- Lethal Chef: Milton received a D- in Home Ec because his cake resulted in the teacher running to the bathroom. When he was baking his second cake, problems arose, when he added a few drops of chemicals in the bowl, the table the bowl is on shook, before he put the cake pan in the oven, the batter is bubbled like boiling lava, when the pan is placed in the oven, the kitchen cabinets all shook violently, and when the cake is finished, it is edible, but due to all the chemicals Milton put in the cake, it blew up after coming in contact with precious metals, namely, the teacher's golden fork.
- Minored in Asskicking: Well, he does take karate lessons.
- Proud to Be a Geek: The official Disney Channel character bio mentions his "nerdy self-confidence".
- Real Men Wear Pink: There's been at least one occassion where Milton wore a pink sweater vest.
- Sensitive Guy and Manly Man: Sensitive Guy (alongside Eddie) to Jack and Jerry's Manly Men.
- Shorter Means Smarter: Inverted. Milton is the tallest of the group.
- Smart People Build Robots: A transforming one in Rock'em Sock'em Rudy. We only get to see the alt mode that actually looks like a high school kid built it in a home garage and the shadow cast in the Humongous Mecha mode.
- Unsportsmanlike Gloating: Because of this, he's one kyu below where he "should" be, having lost his yellow belt immediately after being awarded it in The Pilot. It's a weakness that he's slowly growing out of...slowly.
- Zettai Ryouiki: When not wearing his gi, he almost always wears shorts and kneesocks.
Played by: Mateo Arias
- The Cast Showoff: Mateo Arias has gotten to showcase his dancing skills in many episodes.
- Catchphrase: "Wooooh!" and "Really, Jerry, really?!"
- Delinquent: A detention regular.
- Does Not Like Spam: Jerry is afraid of saltines because as a kid, he was eating one when he saw his grandmother wearing a bikini.
- Gratuitous Spanish/Bilingual Bonus: In "All The Wrong Moves" he said something in Spanish while teaching everyone how to dance.
- Raised by Wolves: Claims to be in "Dummy Dancing".
- Sensitive Guy and Manly Man: Manly Man (alongside Jack) to Milton and Eddie's Sensitive Guys. However, he does scream like a girl at times.
Played by: Olivia Holt
- Berserk Button: Apparently, implying/saying Kim is a Dumb Blonde is NOT a good idea. She was ready to hurt Milton (who was pretending to be Jerry as part of a plan) when he said "Forgot I was talking to a blonde".
- She also doesn't like being called "doll". How familiar.
- Dude Magnet: Other than Jack, many guys have been attracted to her, even Jerry.
- Final Girl: In "Wazombie Warriors".
- First Girl Wins: Though she was the last to join the dojo, she was the first to befriend Jack. Every other love interest the two have are Romantic False Leads to their eventual relationship.
- Friend to All Living Things: Kim just LOVES animals. Although it's subverted with ugly animals like springing jellyfish.
- Funny Afro: In "Kung Fu Cop" as Snowflake Jones and "We Are Family" as herself.
- Girly Bruiser: In this interview, Kim is described as a Girly Girl.
- Hair of Gold, Heart of Gold: It goes hand in hand with her heroic and idealistic nature.
- Hair-Trigger Temper: She's usually the first one to resort to violence in a bad situation.
- Large Ham: She has her moments. Especially in "Gabby's Gold".
- Masculine Girl, Feminine Boy: Masculine Girl to Milton's Feminine Boy.
- Official Couple: With Jack, as of "Kickin' It on Our Own". Even more official from "Two Dates and a Funeral".
- Ooh, Me Accent's Slipping: Sometimes, Olivia Holt will slip into her native Tennessee southern accent. Could be justified as Kim is meant to be from the south.
- Put on a Bus: Leaves the show at the end of season 3. In-series, her character is accepted to a dojo in Japan. In real life, it's because Oliva signed on to do I Didn't Do It on Disney Channel and wanted to avoid scheduling conflicts. However, she will return for a few episodes in Season 4.
- Slapstick Knows No Gender: A few occasions, such as getting stuck in Truman's duct-tape trap or being flattened by a church door.
- The Smurfette Principle: Kim is the only girl in the main cast.
- Squashed Flat: In Meet the McKrupnicks, she was squashed by a over 200 pound church door. After she was flattened, Jack said she looked a little pancakeish.
- Tsundere: To Jack. Lampshaded in "Ricky Weaver".
Played by: Alex Christian Jones
Played by: Jason Earles
- The Chew Toy: He can't go one episode without getting injured in some way.
- Crouching Moron, Hidden Badass: Occasionally, the writers remember that he's supposed to be a karate sensei...
- Parental Substitute: He is sometimes this to Jack, evident especially during the episode "It Takes Two to Tangle"
- Becomes this to Sam, an orphan.
Played by: Dan Ahdoot
Played by: Brooke Dillman
Played by: Ian Reed Kelser
Played by: Wayne Dalglish
- Arch-Enemy: To the Wasabi Warriors as Sensei Ty's primary student. Though as the show went on and he suffered Villain Decay, he was seen less of an enemy and more of a nuisance, and the weaker students of the Wasabi Dojo stopped being scared of him.
- Even Evil Has Standards: Frank may be a cheater and a liar who did many bad things, but stealing Seaford High's turtle is a line Frank would never cross.
- Although it's deconstructed since Frank doesn't care about the turtle and more about the quality of the prank.
- Not Me This Time: In "Jack Stands Alone", it turns out Frank was framed by Erica.
- Villainous Breakdown: After he found out he was being framed.
Played by: Loni Love
- Lethal Chef: As shown in "Sensei & Sensibility".
Played by: Joel McCrary
- Acrofatic: He's able to kick a surprising amount of ass for his size.
- No Doubt The Years Have Changed Me: As the series began, Bobby Wasabi was a former movie star who hasn't been seen in public for at least two decades. When he first made an appearance, he was so overweight people had problem linking him to the movie star. No wonder the producers making a movie of his life wanted him to be portrayed by somebody else.
- Too Dumb to Live: Selling the dojo to a group of cheating tyrants