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Hero Overview

I'll lead them and I'll shut you down if it's the last thing I do.
~ Kai to Morro.

Kai is the deuteragonist of LEGO Ninjago: Masters of Spinjitzu. He is the Elemental Master and Ninja of Fire, and Nya's older brother. Kai and Nya continued to work as blacksmiths in their missing father's shop. With the help of a wise master, Wu, Kai learnt Spinjitzu and discovered his three other teammates, with whom he embarked on many adventures with as they battle the Serpentine and eventually The Great Devourer.

Kai and the Ninja soon fought the Stone Army in a desperate effort to prevent the final battle, which was soon made all but certain. After Lloyd defeated the Overlord and his father was purified of evil, peace resumed in Ninjago until Pythor returned, aiding The Overlord in becoming the Golden Master and commanding the Nindroid army. The Ninja fought the Overlord and his Nindroids until Zane sacrificed himself, vanquishing the Overlord but seemingly dying in the process. The Ninja team separated until Lloyd reunited them to rescue Zane on Chen's Island. There, they competed in the Tournament of Elements before allying with the other Elemental Masters to defeat Chen's army. Soon after the war's end, Lloyd was possessed by Morro, who escaped the Cursed Realm and released a legion of ghosts. The Ninja battled Morro and his forces at Stiix before the Cursed Realm was destroyed.

The Ninja found fame after saving Stiix, with Kai becoming obsessed with his popularity. Yet they found themselves facing a new problem when Nadakhan returned with the Sky Pirates. During their first encounter, Nadakhan trapped Kai in the Sword of Souls, though he was later freed by Jay. Kai witnessed Nya die after being struck by Tiger Widow venom, though Jay's final wish reversed recent events, saving her. On the Day of the Departed, Cole accidentally revived the Ninjas' old enemies, including Chen, who attacked Kai and Nya. The siblings defeated Chen before going to Yang's Temple, where they witnessed Cole become a human.

When the Time Twins returned to Ninjago, Krux tried to convince Kai that Kai's parents were traitors. Kai and Nya reunited with their parents and stopped Krux and Acronix from changing the future. They managed to track them through time and stopped them before Wu sent Kai and Nya back to the present, while Wu ended up lost in the time.

Kai and the ninja later watch over Princess Harumi after she lost her adopted parents. They later discover that she secretly is the leader of the Sons of Garmadon and wants to resurrect Lord Garmadon. Despite the ninja's efforts, Harumi successfully resurrects Garmadon, and shortly after, Kai ends up marooned in the Realm of Oni and Dragons, which is also known as the First Realm, with Cole, Jay, Zane, and the de-aged Wu. Kai and the ninja help save the various dragons from the Dragon Hunters and help the now-teenage Wu regain his confidence and memories. After Iron Baron is defeated by Firstbourne, Wu reclaims the Dragon Armor, in turn allowing them to return to Ninjago. Upon returning, along with his fellow ninja, he takes down Garmadon's Colossus while Lloyd defeats his father, restoring peace to Ninjago once again. Afterward, he along with the other ninja attend the celebration and Kai and Skylor share a moment. When the Oni finally invade, the ninja team up with Lord Garmadon, and Kai and the rest of the ninja fight to defend their home. Kai used his blacksmithing skills to reforge Golden Weapons, using the Golden Armor, and later defeats the Oni by using the Tornado of Creation with the other ninja, Wu, and Garmadon.

Months later, Kai and his friends fight against Aspheera and her Pyro Vipers after accidentally releasing them from their tomb, and Aspheera took away Kai's power, making Kai think that he can't help. After Zane is banished by Aspheera's sorcery, he and the remaining ninja send themselves to the Never-Realm to rescue him, a land ruled by the Ice Emperor. While Lloyd went to find Zane, Kai and the others protected the Ice Fishers of Great Lake, who call Kai the Fire Maker after he relights the Hearth Fire and regains a fraction of his power. After failing to prevent Boreal from freezing the village, Kai makes up for his loss by regaining his full powers in time to destroy the Ice Dragon, discovering that Zane is the Ice Emperor. With Zane having managed to return to his senses and freeing the Never-Realm from its eternal winter, the team reunite together and use Traveler's Tea to head back to Ninjago.

Sometime later, Kai and the other ninja enter the virtual world of Prime Empire, when the legendary arcade game resurfaces and hundreds of gamers are zapped into it. Due to his recklessness, Kai was the first to lose all but one of his lives, and later, he and Cole sacrifice themselves in a race, allowing the rest to win. Eventually, Jay was able to help Unagami and Milton Dyer make amends, releasing Kai and the others trapped in the game.

Kai later traveled to the Kingdom of Shintaro on top of Shintaro. When he discovers Cole was captured by the evil Skull Sorcerer, he travels underground and helps save him. Zane and Kai later get captured by the Geckles and tames a creature known as a Mino. Zane and Kai try to unite the Geckles and the Munce but end up being captured along with Jay, Nya, Lloyd, and Zane. The Skull Sorcerer sentences them to death, but they are saved by Plundar, a member of the Upply, under Cole's command. Kai helps the other ninja fight against the Re-Awakened and they eventually succeed. Kai, Wu, and the other ninja leave Shintaro, but prepare to go on another adventure.

Kai traveled to The Island of the Keepers to save Misako and Wu. There, the ninja discovered the Storm Amulet and the existence of Wojira.

When Nya lost control of her powers, he stayed behind at the monastery along with Cole while the others went to investigate. Later on, he attempted to stop Kalmaar from awakening Wojira, but ultimately failed and he assisted the other ninja in the fight that followed. He was saddened when Nya left, and attended her memorial.

He is voiced by Vincent Tong, who voiced Prince Nicholas in Barbie: Princess Charm School, Flash Sentry from My Little Pony: Equestria Girls film series, Sandbar in the My Little Pony: Friendship is Magic TV series, while his movie voice is provided by Michael Peña who portrays Luis from Marvel Cinematic Universe


Kai has tall, thick spiky reddish-brown hair, shaped like fire. He is often seen with a focused expression on his face, with a scar visible on his right eyebrow and bandage above his left. Before Season 8, his eyebrows were black, his bangs parted to the right and instead of a scar, he had a notch on his left eyebrow. Kai wears Red Gi's All throughout the Series. Briefly that he will wear a different color. When he was a Blacksmith, Kai wore a white shirt and red pants as well as an orange apron.


Fittingly for his elemental affinity, Kai is a very hotheaded boy, prone to taking action before he thinks things through. He is capable of making careful observations when the need arises, but his emotions often override his caution. His single-mindedness made interaction with his teammates difficult at first (especially due to his worry about Nya), but he eventually learned to work with the other Ninja. He can be arrogant at times, insisting that he is better than his peers and growing depressed when he seems to be lagging behind their training.

Later, following the Ninjas' fame, Kai would end up getting something of a larger head and bigger ego, constantly flirting with girls and enjoying the merchandise styled after him. Likewise, he indulged in his fame the most out of all of the ninja.

Kai also has something of a stubborn side, believing that he is in the right until overwhelming evidence to the contrary is presented. This is especially pronounced during Lord Garmadon's stay on the Destiny's Bounty; Kai repeatedly accused the four-armed villain of treachery or plotting despite Garmadon's insistence that saving Lloyd was his primary concern at the time. On the other hand, Kai's stubborn streak lends him incredible determination that allows him to bolster the team's spirit in the face of impossible odds.

The most prevalent facet of Kai's personality is his good heart and dedication to people he cares about—if someone can earn his friendship, he will stop at nothing to protect them. Much of his stubbornness and recklessness are due to his desire to help his loved ones, either directly or by becoming strong enough to defeat anyone who might threaten them with their plans. In turn, his friends and family work to balance out Kai's more extreme traits, causing him to become a levelheaded mentor for Lloyd by the time he and his comrades begin training the Green Ninja.


  • Fire
    • Fire Manipulation - The user is able to manipulate, generate, negate, and control fire from existing sources or the ability to manipulate flames with a flick of the hand or a snap of the finger, often used as a projectile, and to create fireballs of different size and throw or use them as melee advantage. Additionally, it can be used to break ice, illuminate areas, or reignite flames that have been put out.
    • Pyrokinetic Flight - This gives the user the power to propel themselves up or forward using Fire.
    • Fire Shield Construction - The user can create shields of varying shapes and sizes out of fire.
    • Heat Generation/Absorption - The user can generate or absorb heat for a variety of purposes, by making things hotter or melting objects
    • Fire Blast - The user can release fire over a specific target area causing great damage and/or delivering great shock waves of pure force.

Via Staff of elements (formerly)

  • Energy
    • Energy Manipulation - The user is able to manipulate and generate energy. This Elemental Power makes the user able to create powerful beams as explosions and use the power as a matter to generate force fields or control their power levels to increase or suppress their attacks.
    • Energy Ball Projection - The users of this ability are able to create green balls of energy that they can use as part of a melee attack or as a way of transportation.
  • Lightning
    • Electricity Manipulation - The user can create, generate, increase, absorb, conduct, shape, and manipulate electricity of various intensities. Users of this element can redirect natural lightning in an electrical storm, electrocute opponents, and cause electrical explosions. Also, the user can use it against an adversary.
    • Lightning Blast - The user can release electricity over a specific target area which causes great damage and/or delivers great shock waves of pure force.
  • Ice
    • Ice Manipulation - The user can create, generate, and manipulate ice , create ice constructs, induce chills, and extinguish fires. The user can even use this to freeze designated areas underwater and sometimes create ice without even using a beam, instead using their hands to magically generate ice.
    • Ice Blast - As demonstrated by the Elemental Master of Ice, the user can release ice over a specific target area causing great damage and/or delivering great shock waves of pure force.


I knew when I had to make a choice, I wanted the Fangblade so badly to prove i was good enough to become the Green Ninja. But then I figured it out, All my training to become the best ninja wasn't in preparation to become the Green Ninja. It was to protect him.
~ Kai Explaining how he unlocked his true potential to the ninja.


  • He is voiced by Vincent Tong, who is mostly known for voicing Touta Matsuda from Death Note. in the movie, he is voiced by Michael Peña, who is mostly known for playing Luis in the Marvel Cinematic Universe.
  • He did not like technology most likely due to his past upbringing but he has been seen playing video games and indulging in other technical items, meaning it has grown on him.
  • Kai is similar to Zuko from Avatar: The Last Airbender.
    • Both related to the power of Fire.
    • Both have a Sister. Kai with Nya and Azula with Zuko.
  • Kai is very similar to Tanjiro Kamado from Demon Slayer: Kimetsu No Yaiba.
    • They both have younger sisters respectively (Kai with Nya and Tanjiro with Nezuko).
    • Their fire-based abilities are inherited by their fathers respectively.
    • They are friends with the cowards who use lightning-based abilities and fall in love with their sisters (Jay and Zenitsu).
    • They are also friends with the strongest ones with brutal personalities and obsession with food (Cole and Inosuke).
    • They have parents who were taken away by their arch enemies (The difference is that Ray and Maya were captured by the Time Twins, Krux and Acronix, and Kie Kamado was killed by Muzan Kibutsuji).


           WBLogo.png Heroes

Animated Features
Mewsette | Jaune Tom | Robespierre | Bilbo Baggins | Gandalf | Thorin Oakenshield | Bard the Bowman | Elrond | Thranduil | Sméagol | Fíli and Kíli | Dwalin | Balin | Óin | Glóin | Dori | Nori | Ori | Bifur | Bofur | Bombur | Frodo Baggins | Samwise Gamgee | Aragorn | Meriadoc Brandybuck | Peregrin Took | Éowyn | Théoden | Batman (DCAU) | Thumbelina | Prince Cornelius | Jacquimo | Li'l Bee, Gnatty, & Baby Bug | Mother | Hero | Stanley | Gus | Rosie | Michael Jordan | Stan Podolak | Bugs Bunny | Lola Bunny | Daffy Duck | Danny Cat | Sawyer Cat | Kayley | Garrett | Devon and Cornwall | Ayden | Lady Juliana | Sir Lionel | Bladebeak | Stan Marsh | Kyle Broflovski | Eric Cartman | Kenny McCormick | Iron Giant | Hogarth Hughes | Annie Hughes | Dean McCoppin | General Rogard | Wakko Warner | Osmosis Jones | Leah Estrogen | Drix | Frank DeTorre | D.J. Drake | Kate Houghton | Damian Drake | Mother | Dusty Tails | Hero Boy | Hero Girl | Conductor | Billy the Lonely Boy | Know-It-All | Hobo | Smokey and Steamer | Victor Van Dort | Emily | Scraps | Lucas Nickle | Zoc | Hova | Queen Ant | Wasps | Robin (Original) | Starfire (Original) | Raven (Original) | Cyborg (Original) | Beast Boy (Original) | Mumble | Gloria | Ramón | Nestor | Raul | Lombardo | Rinaldo | Memphis | Norma Jean | Leonardo | Raphael | Donatello | Michelangelo | Splinter | April O'Neil | Casey Jones | Max Winters | Soren | Gylfie | Digger | Twilight | Eglantine | Noctus | Marella | Ezylryb | Carmen | Lovelace | Emmet Brickowski | Wyldstyle | Vitruvius | Batman (Lego) | UniKitty | Benny | Metalbeard | Good Cop | President Business | Finn | The Man Upstairs | Mordecai | Rigby | Benson Dunwoody | Pops Maellard | Skips | Muscle Man | Hi Five Ghost | Junior | Tulip | Diamond Destiny | Alfred Pennyworth | Robin | Batgirl | Lloyd Garmadon | Kai | Jay Walker | Nya | Cole | Zane | Master Wu | Misako | Robin | Beast Boy | Cyborg | Starfire | Raven | Migo | Meechee | Queen Watevra Wa’Nabi | Sweet Mayhem | Scorpion | Liu Kang | Raiden | Johnny Cage | Sonya Blade | Kitana | Jax Briggs | Reptile | Nitara | Scooby-Doo (2020) | Shaggy Rogers (2020) | Fred Jones (2020) | Daphne Blake (2020) | Velma Dinkley (2020) | Blue Falcon (2020) | Dynomutt (2020) | Captain Caveman (2020) | Dee Dee Skyes (2020) | Kung Lao | Kurtis Stryker | Jade | Cyrax | Smoke | Li Mei | LeBron James | Dom James | Courage the Cowardly Dog | Muriel Bagge

Live-Action Films
Dorothy Gale | Toto | Scarecrow | Tin Woodman | Cowardly Lion | Wizard of Oz | Glinda the Good Witch of the North | The Munchkins | Aunt Em | Sam Spade | Miles Archer | Effie Perine | Rick Blaine | Victor Laszlo | Ilsa Lund | Eliza Doolittle (My Fair Lady 1964) | Harry Callahan | Superman (Christopher Reeve Series) | Danny Torrance | Dick Hallorann | Wendy Torrance | Rick Deckard | Gizmo | Billy Peltzer | Kate Beringer | Mr. Wing | Supergirl (Donnerverse) | The Goonies (Mikey, Brand, Chunk, Mouth, Data, Andy & Stef) | Sloth Fratelli | Marion Cobretti | Seymour Krelborn | Audrey | Adam Maitland | Barbara Maitland | Lydia Deetz | Batman | Vicki Vale | Alfred Pennyworth | Harvey Dent | Forster | Luke Eveshim | Helga Eveshim | Robin Hood | Will Scarlet | Azeem | Friar Tuck | Dr. Richard Kimble | Sara Crewe | Robin | Dr. Chase Meridian | Michael Jordan | Stan Podolak | Bugs Bunny | Lola Bunny | Daffy Duck | President James Dale | General Decker | Byron Williams | Barbara Land | Tom Jones | Taffy Dale | Billy Glenn Norris | Richie Norris | Grandma Norris | Cedric and Neville Williams | Batgirl | Neo | Morpheus | Trinity | Carter Blake | Susan McCallister | Russell Franklin | Janice Higgins | Tom Scoggins | Jim Whitlock | Sherman "Preacher" Dudley | Paul Edgecomb | John Coffey | Brutus "Brutal" Howell | Eduard Delacroix | Mr. Jingles | Lou | Butch | Ivy | Sam | Peek | Osmosis Jones | Leah Estrogen | Drix | Frank DeTorre | Harry Potter | Ron Weasley | Hermione Granger | Sheldon Mopes | Rainbow Randolph | Scooby-Doo | Shaggy Rogers | Fred Jones | Daphne Blake | Velma Dinkley | Mary Jane | Emile Mondavarious | Chris McCormick | Sheriff Sam Parker | D.J. Drake | Kate Houghton | Damian Drake | Mother | Dusty Tails | Patrick Wisely | Jeremiah Wickles | Xan | Duma | Ripkuna | Peter | Kristin | Rip's Family | Charlie Bucket | Willy Wonka | Joe Bucket | Oompa Loompas | Mr. Bucket | Mrs. Bucket | Charlie's Grandparents | Candyman | V | Evey Hammond | King Leonidas | Sweeney Todd | Johanna Barker | Anthony Hope | Tobias Ragg | Maxwell Smart | Max | Wild Things (Carol, K.W., Douglas, Ira, Judith, Alexander & The Bull) | Diggs | Catherine | Seamus | Yogi Bear | Boo-Boo Bear | Ranger Smith | Rachel Johnson | Frog-Mouthed Turtle | Ranger Jones | Babydoll | Sweet Pea | Rocket | Blondie | Amber | Barnabas Collins | Victoria Winters | Elizabeth Collins Stoddard | Carolyn Stoddard | David Collins | Josette du Pres | Willie Loomis | Bilbo Baggins | Gandalf | Thorin Oakenshield | Fíli | Kíli | Dwalin | Balin | Óin | Glóin | Dori | Nori | Ori | Bifur | Bofur | Bombur | Radagast | Elrond | Galadriel | Sméagol | Gwaihir | Frodo Baggins | Raleigh Becket | Stacker Pentecost | Mako Mori | Bard the Bowman | Beorn | Legolas | Tauriel | Thranduil | Godzilla | Ford Brody | Ishiro Serizawa | Vivienne Graham | William Stenz | Joseph Brody | Sandra Brody | Elle Brody | Joseph Cooper | Amelia Brand | Dáin Ironfoot | Napoleon Solo | Illya Kuryakin | Gaby Teller | Alexander Waverly | Tarzan | Jane Porter | George Washington Williams | Akut | Kala | Kerchak | King Kong | James Conrad | Mason Weaver | Hank Marlow | William Randa | Houston Brooks | San Lin | The Losers Club (Bill Denbrough, Ben Hanscom, Beverly Marsh, Eddie Kaspbrak, Mike Hanlon, Richie Tozier & Stan Uris) | K | Lara Croft | Richard Croft | Lu Ren | Parzival | Art3mis | Curator | Anorak | Daito | Aech | Sho | Davis Okoye | Dr. Kate Caldwell | George | Agent Harvey Russell | Jonas Taylor | Suyin Zhang | Dr. Minway Zhang | Meiying Zhang | Jaxx | Mac | DJ | Lori Taylor | Dr. Heller | Toshi | The Wall | Mowgli | Bagheera | Baloo | Kaa | Akela | Bhoot | Nisha | Vihaan | Gray Brother | Colonel Hathi | Detective Pikachu | Tim Goodman | Lucy Stevens | Mothra | Rodan | Mark Russell | Madison Russell | Emma Russell | Sam Coleman | Ilene Chen | Rick Stanton | Behemoth | Scylla | Methuselah | Queen MUTO | Harley Williams | Beth Williams | Austin Williams | Snorky | Paige | Zoe | Parker | Abra Stone | Billy Freeman | Roger | Gwen | Old Ed | Duke | Tom Cat | Jerry Mouse | Kayla Forester | Spike Bulldog | Toodles Galore | Ilene Andrews | Nathan Lind | Jia | Josh Valentine | Bernie Hayes | Cole Young | Sonya Blade | Jax Briggs | Liu Kang | Kung Lao | Raiden | Scorpion | LeBron James | Dom James

Video Games
Talion | Celebrimbor | Batman | Lucius Fox | James Gordon | Renee Montoya | Peter Grogan | Catwoman | Harvey Dent | John Doe | Alfred Pennyworth | Iman Avesta | Vernon Blake | Tiffany Fox

Bugs Bunny | Daffy Duck | Porky Pig | Lola Bunny | Tweety Bird | Sylvester | Granny | Elmer Fudd | Yosemite Sam | Tasmanian Devil | Foghorn Leghorn | Road Runner | Speedy Gonzales | Pepé Le Pew

See Also
Adventure Time Heroes | Amblin Entertainment Heroes | Animalympics Heroes | Arrowverse Heroes | Batman Heroes | Ben 10 Heroes | Camp Lazlo Heroes | Cartoon Network Heroes | Cats & Dogs Heroes | Courage the Cowardly Dog Heroes | Craig of the Creek Heroes | DC Animated Movie Universe Heroes | DC Extended Universe Heroes | DC Super Hero Girls Heroes | Friends Heroes | Game of Thrones Heroes | Hanna Barbera Heroes | Hanna-Barbera Cinematic Universe Heroes | Happy Feet Heroes | Harry Potter Heroes | Jellystone! Heroes | Laika Heroes | Legendary Entertainment Heroes | Loonatics Unleashed Heroes | Looney Tunes Heroes | Mad Max Heroes | Middle-Earth Heroes | MonsterVerse Heroes | Mortal Kombat Heroes | New Line Cinema Heroes | Pokémon Heroes | Powerpuff Girls Heroes | Regular Show Heroes | Rick and Morty Heroes | Road Rovers Heroes | Sesame Street Heroes | Scooby-Doo Heroes | South Park Heroes | Space Jam Heroes | Stephen King Heroes | Steven Universe Heroes | Superman Heroes | The Amazing World of Gumball Heroes | The Flintstones Heroes | The Jetsons Heroes | The Larry Sanders Show Heroes | The LEGO Movie Heroes | The West Wing Heroes | Tim Burton Heroes | Tiny Toon Adventures Heroes | Tom and Jerry Heroes | TMNT Heroes | Veep Heroes | We Bare Bears Heroes | Westworld Heroes | Xiaolin Showdown Heroes | Yu-Gi-Oh! Heroes

           The Lego Movie Logo.png Heroes

Emmet's Gang
Emmet Brickowski | Wyldstyle | Vitruvius | Batman | Unikitty | Benny | Metalbeard

Gotham City
Batman | Alfred Pennyworth | Robin | Batgirl

Lloyd Garmadon | Kai | Jay Walker | Nya | Cole | Zane | Master Wu | Misako

Good Cop | President Business | Finn | The Man Upstairs | Queen Watevra Wa’Nabi | Sweet Mayhem