Kai

Kai is the current Elemental Master and Ninja of Fire, Nya's older brother, Skylor’s boyfriend, Ray and Maya's son, and mentor of Wyldfyre. He and his younger sister worked as blacksmiths in their father's blacksmith shop all their life until they met Master Wu. With his guidance, Kai learned Spinjitzu and discovered his other teammates, Cole, Jay, Zane, and Lloyd, with whom he embarked on many adventures, battling the likes of the Serpentine and the Stone Army.
After Zane's sacrifice to defeat the Overlord, the ninja parted ways before reuniting to go rescue Zane on Chen's Island. There, Kai grew closer to Skylor, one of the tournament contenders, as they competed in the Tournament of Elements. Ultimately, he allied with the other Elemental Masters to defeat Chen's Anacondrai Cultists. After the war ended, Lloyd was possessed by Morro, who escaped the Cursed Realm and released a legion of ghosts. Kai and the ninja battled Morro and his forces before the Cursed Realm was destroyed.
The ninja found fame after saving Stiix, but when Nadakhan returned with the Sky Pirates, Kai was the first of the ninja trapped in the Sword of Souls. Jay eventually freed him and the rest of the ninja, and reversed these events with his final wish. On the Day of the Departed, Kai and Nya fought a revived Chen, who they defeated once more. 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, but at the cost of losing Wu in the Time Vortex. 
A year later, Kai and the ninja watch over Princess Harumi after she loses her adopted parents. They later discover she's secretly the leader of the Sons of Garmadon and wants to resurrect Lord Garmadon. Despite the ninja's efforts, Harumi succeeds, and shortly after Kai is marooned in the First Realm with Cole, Jay, Zane and a de-aged Wu. Kai and the ninja help save the dragons from the Dragon Hunters, and help Wu regain his confidence and memories. After Iron Baron's defeat, Wu reclaims the Dragon Armor, in turn allowing them to return to Ninjago. Kai and his allies take down Garmadon's Colossus, restoring peace to Ninjago once more. Not long after, the malicious Oni invade Ninjago, forcing the ninja to ally with Lord Garmadon. Kai uses his blacksmithing skills to reforge the Golden Armor into the Golden Weapons, 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 Aspheera and her army, after accidentally releasing them from their tomb, and Aspheera seizes Kai's power. After Zane is banished by Aspheera's sorcery, Kai and the ninja search for him in the Never-Realm. While Lloyd goes to find Zane, Kai and the others protect the Ice Fishers from the Ice Emperor's Blizzard Samurai, and he regains his element in time to combat Boreal. The ninja learn a memoryless Zane was manipulated into becoming the Ice Emperor. He returns to his senses and frees the realm from its eternal winter, and the ninja return to Ninjago. 
Over the next few months, the ninja face numerous new threats. They enter the virtual world of Prime Empire when hundreds of players are zapped into the game. During their quest to stop Unagami, Kai and Cole sacrifice themselves in a race, but everyone is restored to reality when Jay helps Unagami and his creator make amends. Kai and the ninja later traveled to the Kingdom of Shintaro, where Vangelis discreetly terrorizes the Geckles and Munce as the "Skull Sorcerer". The ninja struggle to bring peace to Shintaro, but are eventually captured. After being freed, they fight the Re-Awakened and defeat the Skull Sorcerer. Kai and the ninja later travel to the Island of the Keepers to save Misako and Wu. There, the ninja discover the Storm Amulet and the existence of Wojira - an ancient serpent that Kalmaar of Merlopia seeks to unleash. The ninja journey to the Endless Sea to investigate, but are unable to stop the beast's awakening, and Ninjago City is flooded. Ultimately, Nya sacrifices herself and becomes one with the sea in a bid to defeat Wojira. 
A year after Nya's loss, Kai has opened up his own dojo. When the ninja come together and Nya manifests in a water form, they devise a plan to drain her power and restore her body. The ninja break Aspheera out of Kryptarium and steal her staff; she restores Nya, but the ninja are arrested for their actions. They escape a prison bus and set off to learn of the Crystal King, who assembled a council of the Ninjas' worst villains - including a revived Harumi. In the ensuing chaos, the Crystal King - revealed as the Overlord - unleashes an army of Crystal Warriors to ravage and corrupt the people of Ninjago. The final battle commences, with the ninja and all their allies through the years coming together to fight The Overlord, his confidants and his army. The ninja combine the Golden Weapons, releasing their powers in the form of the Golden Ultra Dragon, which helps Lloyd vanquish the Overlord. The ninja and their allies celebrate their greatest victory, and come together to rebuild the monastery.
Several weeks later, Kai went on a journey with Skylor to defeat a tribe worshipping Fire Fang and regains his powers in the process.
When The Merge occurred, where all realms formed into one, Kai woke up on an unfamiliar island and spent weeks trying to find the monastery, managing to reunite with Lloyd. Taking the Bounty, Kai went on a journey to study the combined realms while keeping Lloyd up to date, until he stopped upon reaching the Realm of Madness, reunites with Nya and helps to defend the Craglings from dragons. Kai remained at the monastery, where he was called towards the mysterious Monastery of Imperium, where he and Nya meet up, find Zane, and help Lloyd, his students, Riyu, and Wyldfyre escape from Imperium. While searching for the Dragon Core in Wyldfyre's old home, Kai came across the Lava-tides, who were miffed by Wyldfyre's pranks, until they manage to get the core. However, Dorama managed to swap it with a fake beforehand. And while waiting for Heatwave to heal, Kai taught Wyldfyre patience, eventually taking her under his wing. After discovering the fake, Kai and Wyldfyre, along with Lloyd, Zane, and Arin return to Imperium, where they're recruited by a resistance to expose Empress Beatrix's lies before she used a weapon to create a MergeQuake storm, which Kai was sent into a rift but was brought back after Lloyd stabilized the merged realms and during one lesson, Kai discovered his and Wyldfyre's powers are different.
Sometime later Kai helped other ninja to handle Lobbo being mutated, stopping the Mechanic and stopping the Lava-Tides from stealing dragon eggs.
A year later upon hearing about Ras occupying the Cloud Kingdom. Kai alongside other ninja went on the Cloud Kingdom to stop Ras and his evil plans, hoverer Kai alongside other ninja had no other choice than retreat as Cinder by using Shatterspin easy defeated all of the ninja. Upon hearing about Dragon Masters that the ninja had to find to stop Ras, Kai alongside other ninja went to the Dragon Masters' Dojo, but Kai alongside other ninja were first needed to pass through the Phantasm Cave to get to the Dragon Masters' Dojo after succeeding in passing the Phantasm Cave Kai alongside other ninja arrived at Dragon Masters' Dojo when they were first stopped by Egalt until the ninja succeeded in passing three tests and second Dragon Master have arrived. After Kai alongside other ninja explained why they are here and asked Egalt and Rontu to train them, they accepted to train Kai and other ninja. Kai and other ninja continued their training under Egalt and Rontu until Blood Moon arrives. After Jordana succeeded in destroying Destiny's Bounty Kai alongside Sora and Wyldfyre head to the Wyldness where Kai alongside Sora and Wyldfyre were first stopped by Wolf Mask Warriors until they managed to defeat them. After Wolf Mask Warriors were defeated Kai alongside Sora and Wyldfyre put up a Wolf Mask Warriors disguise to sneak up to the Ritual of the Blood Moon. After Ras seen that the ninja takes advantage in the fight against his army Ras used his golden hammer to trap Kai in the Nether-Space. Unfortunately, despite Ninja's efforts in saving Kai from being trapped in the Nether-Space, Ras succeeded in trapping Kai in the Nether-Space which allowed Nokt to be freed from the Nether-Space, hoverer after Nokt was freed from the Nether-Space Bonzle succeeded in closing the portal, after being trapped in the Nether-Space Kai meet in face to face with Bonzle. Bonzle apologized to Kai who reassured her that no apology was needed.
==History==
==Students==
*Wyldfyre (Elemental Master of Heat; first student)
==Appearance==
F132073873452272522(0).jpg|Kai's current appearance
Kai S9.png|Kai's S8-10 appearance
AvataKai.jpeg|Avatar Kai
File:Child Kai (DR).png|Young Kai (Dragons Rising)
 Typically preferring red attire, Kai has tall, thick spiky brown hair, shaped like fire, similar to his hair in The LEGO Ninjago Movie. He is often seen with a focused expression on his face, with a scar visible on his right eyebrow and a bandage above his left, which has been there for a long time, possibly because he thinks it looks cool.https://twitter.com/TommyAndreasen/status/1167746851661131776 Before Season 8, his hair was a slightly darker shade of brown, his eyebrows were black, his bangs parted to the right and instead of a scar, and he had a notch on his left eyebrow. However, he has a scar below his eye in the LEGO sets released prior to Season 8, which is now reflected in the sets and in the show after Season 8 onwards. From Season 11 onward, his hair is more textured with color.
Flashbacks from Season 7 show that Kai used to have freckles when he was young, while wearing short tan pants are a red shirt with his lion symbol. In a flashback from "Fugitives From Madness," Kai now uses his physical set hairpiece (most likely due to WildBrain not having access to the original hair model), and has brown eyebrows and the shirt is slightly redesigned, now using his legacy lion symbol.
In "Way of the Ninja" and "Endings," Kai wore a white shirt and red pants as well as an orange apron. Since "The Royal Blacksmiths," Kai's civilian attire consists of a red half-zipped up sweater over a maroon shirt with his symbol on the chest and brown pants. Throughout Season 6, he wore a red cap over his hair to conceal his identity. In the pilot and The New Masters of Spinjitzu, it can be observed that Kai has chest hair while wearing pajamas, but in later appearances where his chest is visible, including the appearance of his past self while time traveling to the events of the pilot, the hair is no removed, retconning his original torso.
BE0F88F6-D0E1-485E-9245-6B670AF667BD.jpeg|Kai's original appearance
Child kai 1.png|Young Kai
In an anime-styled scene of "The Absolute Worst," Kai's eyes are shown to be brown.
In Prime Empire, Kai's avatar gives him a different look. His hair is now blond and he has red paint over his eyes, similar to Harumi. He also has a red square print that is half-hidden on his chest and wears a sleeveless red gi with gold bolt-like patterns and dark red diamond-shaped marks on the chest.
For more images on Kai's appearance in his different ninja suits, click here.
==Age==
The ninjas' ages are not specified.https://twitter.com/otherland71/status/1662922746509287424
Ninjago: Like the majority of his fellow ninja, Kai was a teenager at the start of the original series.https://twitter.com/TommyAndreasen/status/800279588173676549 He is 2 years older than Nya.https://twitter.com/TommyAndreasen/status/780896293421854721 However, the ninja do not officially have specific ages,https://twitter.com/TommyAndreasen/status/942371358138421248 as they were meant to be perpetually in their teenage years for the duration of the original series.https://twitter.com/brothershageman/status/909594849862492160 As of Hunted, he and the other three original ninja were stated to be "grown-up teenagers" by Jay."The Gilded Path" Misako later referred to Kai as a grown man, implying he was a legal adult as of Seabound."The Call of the Deep"
Dragons Rising: The Merge occurs sometime after Crystalized, and the main events of the series take place an unknown amount of years later. Children before the merge grew into teenagers, which may imply that he and the other original five ninja, excluding Zane, are now young adults in their 20s instead of teens. However, as mentioned above, the creators do not specify ages.
Potential Estimations: During the events of the pilot and Season 1, Kai may have been at least 15 or 16 years of age.https://www.youtube.com/watch?v=2kMWaHNh9Gw&t=644shttps://twitter.com/TommyAndreasen/status/780896469381328896
==Relationships==
===Family===
*Ray (father)
*Maya (mother)
*Nya (sister)
===Allies===
*Skylor (girlfriend)
*Ninja
*Sons of the First Spinjitzu Master
**Garmadon (former enemy)
*Dragons
*Stone Army (former enemies; destroyed)
*Serpentine (former enemies)
*Nindroid Army (former enemies)
*Ninjago Police
*Ninja Replacements (in an alternate timeline)
*Morro (former enemy; deceased)
*Dragon Hunters (former enemies)
*Ice Fishers
*Krag
*League of Jay
*Geckles
*Munce
*Upply
*Keepers (former enemies)
*Merlopians (former enemies)
*Sally
*Harumi (former enemy)
*Writers of Destiny
*Spirit of the Temple (former enemy)
*Alfonzo Frohicky
*Imperium Teen Resistance Force
*FrogtorHurry, Call a Doctor!
*Bonzle
===Enemies===
*Skulkin
*Evil ninja (destroyed)
*Pirates
*Anacondrai Cultists (deceased)
*Kryptarium inmates
*Ghost Warriors (deceased)
*Fenwick
*Sky Pirates
*Shadow Army
*Time Twins
*Vermillion
*Sons of Garmadon
*Iron Baron
*Oni
*Pyro Vipers
*Unagami's army (formerly)
*Henchmen
*Re-Awakened (deceased)
*Wojira
*New Ninja (formerly)
*Crystal army
*Tentacled beasts
*Claws of Imperium (formerly)
*Empress Beatrix
*Greenbone Warriors
*Lava-Tides
*Dorama
*Dorama's stagehands
*Imperium Guards (formerly)
*Wolf Clan
==Personality==
Fittingly for his elemental affinity, Kai is very hot-headed, 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 very cocky at times, especially earlier in his career as a ninja, sometimes even to the point of selfishness, insisting that he is better than others, gloating about his victory, or yelling about his failures. He seems to have a large ego as he wanted to be the Green Ninja and lead the team. He eventually grew out of this for the most part, though he occasionally lapses back into a similar mindset. But those emotions are also when his strength is greatest, especially when protecting those he cares about. Kai's personality represents caution, growth, safety, and warmth. He may not say it much, but he deeply cares about his loved ones and will do anything to protect them, even at the cost of his own life, which is why he's so overconfident.
Later, following the ninja's 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. He indulged in his fame the most out of all of the ninja."Infamous" Usually, because he often feels insecure, Kai feels like he's useless or insignificant at times or not as good as the other ninja.
Kai also has something of an overconfident 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."The Green Ninja" 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.
Despite having no powers at the time, Kai showed intense loyalty through his determination to protect Lloyd when the latter was possessed by Morro."Winds of Change" As time passed, Kai mentally connected his power with his self-worth to a greater degree, at one point hesitating to give up his power to save Lloyd and, at another point, losing hope when his power was taken by Aspheera."Big Trouble, Little Ninjago"https://twitter.com/brothershageman/status/977536779627610114"Powerless"
Overall, Kai is a tough, brave, confident, passionate ninja. The most prevalent facet of Kai's personality is his good heart and dedication to the people he cares about—if someone can earn his friendship, he will stop at nothing to protect them. Much of his stubbornness and recklessness is 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 level-headed mentor for Lloyd by the time he and his comrades begin training the Green Ninja. According to Zane, Kai's desire to protect his friends is just as powerful as his temper.
Unlike his sister, Kai likes to spend time with his parents and does not mind it when his mother tends to baby him. He also formed a better relationship with Ray while playing video games at the monastery with Cole.
==Weapons and abilities==
===Abilities===
*Fire: Being the Elemental Master of Fire, Kai can create Fire with his own hands and either throw it, use it as boxing gloves, or unleash a burst of flames towards his opponents. It is also shown that he can withstand high temperatures and walk through fire unharmed. He also has the ability to move fire at will.
**Smoke: Kai can create small blasts of smoke with his hands, as shown in Back in Action! (possibly non-canon).
**Spinjitzu: Kai is capable of performing Spinjitzu.
***Rising Dragon: Kai is capable of performing the Rising Dragon through his Spinjitzu.
**Airjitzu: Kai is capable of performing Airjitzu.
**Fire Dragon: Kai can unlocked his Fire Dragon after conquering his inner fears and doubts. The dragon allows him to travel quickly through the air and shoot large blasts of Fire that deal devastating damage.
*Combat: Even before his ninja training, Kai is a competent fighter, wielding a sword against the Skulkin when they attacked the blacksmith shop. Kai is also capable of performing hand-to-hand combat against Serpentine, Stone Warriors, and Nindroids. Kai manage to fight Karlof and Ash in the Tournament of Elements. Although Kai lost twice against Karlof, he still manage to put up a fight and had the upper hand in the first half of both fights. In his fight with Ash, Kai mostly fought using his ninja training skills. Once Kai started to use his powers, he manage to defeat Ash. Kai also manage to take on Morro while he was in Lloyd's body. Kai also manage to go toe-to-toe with the Time Twins Krux and Acronix. Kai also manage to fight Kalmaar in a truck. He also manage to have the upper hand against his fight with Aspheera, before Pythor help restrain him. Years later after the Merge, Kai skills improved to the point where he manage to fight the Wolf warriors and the New Master of Smoke, Cinder, and even predict his attacks. Once Kai learned the Rising Dragon, he manage to outmatch Cinder again.
*Swordsmanship: As Kai's primary weapon is often swords, he is skilled in using many types of blades.
*Leadership and Strategy: Before Lloyd became leader, Kai was known to lead the original ninjas to successful battles. Known for his strategic planning, quick thinking and leadership skills, Kai is often second or third in command, taking charge when the leader is unavailable or delegates their role. Kai's leadership skills and strategic planning often save his team from difficult situations as they battle against evil forces. 
*Blacksmith: Kai can work as a blacksmith when needed. As seen in "Endings," he was able to melt down the Golden Armor, and reforge it into the weapons it was previously made from. Although, Nya used to tell him he was a terrible blacksmith, as of "Way of the Ninja." Somehow, he was able to gain these skills with hardly any practice at all.
===Weapons===
*Swords, katanas, and blades: Kai favors swords in combat, taking up a curved silver blade against the Skulkin when they attacked his shop. 
**Sword of Fire: He used the Sword of Fire as his primary weapon until it was lost, and then switched to wielding regular katanas.
**Elemental Blade: He eventually gained an Elemental Blade that allowed him to harness his fire abilities to an even greater degree.
**Techno Blade: Months after Lloyd defeated the Overlord, Kai, along with the other three ninja (Cole, Jay, and Zane), receive Techno Blades, a weapon which allows the ninja to hack into any electronics.
**Aeroblade: He also has an Aeroblade (along with Cole, Jay and Zane) that can destroy ghosts.
**Dragon Blade: In Season 7, Kai used a double-bladed dagger created by his father Ray that is use for combat or to create the Fusion Dragon. It can also be used as the key to unlocking the Ancient Library of Hono Mizu, only when the current Masters of Fire and Water are holding it.
**Twin katanas: In Season 8: Sons of Garmadon and Season 10: March of the Oni he switched to using two katanas.
**Golden katana: As of Season 11: Secrets of the Forbidden Spinjitzu, Kai uses his golden katana.
**Prime Blade: Kai's personal weapon used in Prime Empire. This helped him fight to get the purple Key-Tana.
**Machete: In Season 13: Master of the Mountain, Kai briefly used a machete as his weapon.
==In the Tournament app==
Kai is a playable character in the Tournament app. His teacher version can be purchased for 50,000 studs, his jungle version can be purchase for 250,000 studs, and his special move is Spinjitzu, much like Jay, Cole, Zane, Master Wu, and Sensei Garmadon.
==Vehicles==
Kai has owned a variety of different vehicles in his ninja history.
===Dragons===
*Flame
**Kai rode him when he fought the Skulkin and the Serpentine.
**He first appeared in "King of Shadows."
*Elemental Fire Dragon 
**He could summon it at will when he conquered his fear. He used it when he fought the Anacondrai Cultists.
**It first appeared in "The Day of the Dragon."
*Fire Dragon (Core)
**Kai rode it when during his search for Master Wu.
**It first appeared in "Balance."
===Bikes===
*Blade Cycle
**When he focused on the Sword of Fire, he could summon it at will.
**It first appeared in "Snakebit."
*Kai's bike
**Nya gave this to Kai when they were hiding from the Police Commissioner and Ronin.
**It first appeared in "Public Enemy Number One."
===Cars===
*Prototype X-1
**P.I.X.A.L. lent this to Kai so he could go undercover and learn about Project Arcturus.
**It first appeared in "Codename: Arcturus."
*ATV
**This vehicle was claimed by Kai when he and the ninja searched for a quest, ultimately releasing Aspheera from her tomb.
**It first appeared in "A Rocky Start."
===Mechs===
*Fire Mech
**Nya gifted it to him when he was going to fight the Stone Army.
**It first appeared in "Island of Darkness."
*Mech Jet
**This was used in Season 12: Prime Empire, during the Speedway Five-Billion.
**It is also considered a jet since it can transition between both forms.
*Elemental Fire Mech
*A mech made from Chronosteel, which allows it the use Fire. It can also exchange components with other Elemental Mechs.
**It first appear in "What the Mech?"
===Submarines===
*Katana V11
**Kai used it to smuggle the ninja into the Temple of Resurrection.
**Its first and only appearance was in "Dread on Arrival."
*Mini submarine 
**P.I.X.A.L. gave it to Kai to fight off the Merlopians and Wojira.
**It debuted in "The Calm Before the Storm," but was first used in "Assault on Ninjago City."
===Jets===
*Kai Fighter
**Kai hacked into one of the Digital Overlord's surveillance jets to fight the Nindroids using his Techno Blade.
**It first appeared in "The Surge."
*Mech Jet
**This was used in Season 12: Prime Empire, during the Speedway Five-Billion.
**It is also considered a mech since it can transition between both forms.
===Other===
*Golden Dragon Raider
**This vehicle was made by P.I.X.A.L. and MiniPix.
**It was first used in "Public Enemies 1, 2, 3, 4 and 5!"
==Official descriptions==
==Appearances==
==Etymology==
The name, Kai, means "strong," "victorious," and "recovery," in three Asian cultures, all of which fit his hotshot attitude in the ninja's battles. His name may also be derived from the Japanese word Akai, meaning "red." In Scottish, Kai's name means "fire"; matching his elemental power. In Japanese, Kai's name also means "ocean," which annotates his mother's and sister's water abilities. In Hawaiian, Kai's name also means "sea," a further link to his mother's and sister's water abilities. 
Names Kai originally had were Dante and Ash,https://twitter.com/TommyAndreasen/status/771438164170924032 with Ash being the name The Hageman Brothers originally suggested.https://twitter.com/TommyAndreasen/status/1104091249793994752 The name was not used because it was already the name of the protagonist of the Pokémon franchise.https://twitter.com/brothershageman/status/1231450991465156608 Ash was later said on LEGO.com to have been a nickname for Kai when he was young, As Tommy Andreasen was the one who wrote this description in 2012,https://twitter.com/TommyAndreasen/status/789493821243523072https://twitter.com/TommyAndreasen/status/789493965913456641 it can be considered canon.https://twitter.com/TommyAndreasen/status/789492671408644096 Another character similar to Kai ended up using the name Ash, the Master of Smoke.
==Behind the scenes==
*Kai and Nya's surname is unknown, though it was considered to be "Smith" behind the scenes, but this is not necessarily canon to the show.https://twitter.com/TommyAndreasen/status/816778254623404034https://www.youtube.com/watch?v=X-9vChYCmBg&t=508s They were also called this in the 2014 blooper reel.
*Kai kept his original one-sided head-piece for the longest out of all the six ninja lasting until Season 8: Sons of Garmadon. Except for his Stone Armor variant, which was released as an exclusive small set, his Golden Ninja variant, which was released in a Bricktober pack, and his fusion armor variant in 70627 Dragon's Forge, all of his minifigures have featured him with the same scarred face. However, the Stone Armor minifigure includes Kai's show-accurate head without the scar, and in the Dragon's Forge set, Kai has two brand new face prints, one has a confident smirk and the other has an angry facial expression with orange glowing eyes, representing him using one of the Time Blades. In addition, his Golden Ninja variant had a big, toothy smile on it.
**Tommy Andreasen explained that Kai's scar was removed for the show because "he looked way too battle-hardened for the story," specifically "for his humble beginnings."https://twitter.com/TommyAndreasen/status/770303222762397696https://twitter.com/TommyAndreasen/status/779211730845130752 He also could not receive the scar later because of a broadcasting rule that characters can't receive lasting wounds.https://twitter.com/TommyAndreasen/status/1568000386149097473
**Kai's original mouth design was later used on a two recurring faces in the LEGO City theme (and another in reverse).
*To mirror his movie self's appearance, he now has his scar on the right side of his face as of Season 8.
*Kai's elemental symbol is the Chinese character "平," meaning "flat" or "peaceful."
*According to Vincent Tong in the "Ten Years of Spinjitzu" documentary, Kai was originally supposed to have red hair and freckles.https://www.youtube.com/watch?v=Ol4lBKVX8cg&t=2582s
*Kai's physical minifigure prior to Season 8: Sons of Garmadon had a rubber hairpiece. It was not completely show-accurate, as in the show his hair is thinner and slightly longer in the back. 
**Simon Lucas explained in an interview with Brent Miller that this is because WilFilm basically made a custom hairpiece for Kai.https://www.youtube.com/watch?v=bamamSBtONw&t=152s
**In Shadow of Ronin, Kai's hair looks exactly the same as the rubber hairpiece he dons in the sets. It is in a lighter shade of brown.
*Like the other ninja, Kai uses his movie counterpart's hairpiece from Season 8 onward, though it was shortened because Tommy Andreasen did not like the size of his hair from the movie,https://twitter.com/TommyAndreasen/status/955368834768269312 and it is also now a shade of reddish-brown instead of dark brown.
**Tommy Andreasen responded to a question about Kai's hair change with "All it takes to change a head of hair is a brisk breeze,"https://twitter.com/TommyAndreasen/status/915692513037611010 though this does not completely explain it as the texture of his hair also changed.
**His hair-headband combo in The Island is the same height as the set version because it is based on a new, slightly different piece.
*The rest of Kai's scar below his eye is missing in Season 11. Tommy Andreasen pointed out that they did not notice it until it was too late.https://twitter.com/TommyAndreasen/status/1180111467732967424 He said it would appear again in future seasons.https://twitter.com/TommyAndreasen/status/1180164177874345985
**The rest of the scar is also missing for the first 4 episodes of Season 12, until "I am Okino", this is because Kai's model for Season 11 was still used for those episodes. The model was updated in "Shintaro".
*According to Tommy Andreasen, Kai's greatest fear was not being liked or included.https://www.youtube.com/live/uwvezZyxItw?feature=share&t=7721
*Kai was originally going to appear as a cameo in the Monkie Kid episode, "Benched," but it was scrapped.https://twitter.com/Minbitt/status/1623875043158798336
==Trivia==
*Kai is the first character to speak in the franchise.
*Before Lloyd, Kai was the main character of the show. The turning point for this was "The Green Ninja," when Kai realized his destiny was not to become the Green Ninja, but to protect him.
**This is lampshaded when the policeman character in "Winds of Change" asks whether Kai is the "main one."
*In the original series, Kai is the only ninja and protagonist who has never defeated a main and/or final antagonist alone. Lloyd defeated the Overlord in "Rise of the Spinjitzu Master" and Emperor Garmadon in Green Destiny, Zane defeated the Overlord once again in "The Titanium Ninja," Nya destroyed the Preeminent in "Curseworld, Part II" and defeated Wojira by merging with the sea in "The Turn of the Tide," Jay used his final wish to defeat Nadakhan in "The Way Back," Cole defeated the Skull Sorcerer by using the Spinjitzu Burst in "The Son of Lilly," and Wu prevented the Time Twins from continuing their villainy by losing them in the Time Vortex in "Lost in Time."
**When asked about this, Tommy Andreasen stated, "We don't work with these check-the-box charts. Not everyone need to blast out of an erupting volcano to save the future green ninja or melt an ice dragon either."https://twitter.com/TommyAndreasen/status/1375851870221131782
*Kai is the fourth ninja to join the team, the last of the original four to claim his Golden Weapon, the fourth ninja to unlock his True Potential, and the third to last to have a love interest. On the other hand, he was the first ninja introduced in the franchise, the first to tame his respective dragon, and the first ninja to perform Airjitzu.
*He cannot skate, as seen in "Ninja Roll."
*Kai serves as an older brother figure to Lloyd, and has a habit of ruffling Lloyd's hair, which is seen in "Pirates vs. Ninja," "Winds of Change," and "The Mask of Deception."
*He apparently appears to have a fear of Christmas-related subjects, as shown in "Can of Worms," when the Venomari's venom causes him to see things like Santa Claus, gingerbread men, and elves.
*Kai is mentioned to be aquaphobic during "Stiix and Stones" and to have an extreme fear of water. It is ironic, then, that his sister turned out to be the Elemental Master of Water. However, this is a direct contradiction to "Rise of the Spinjitzu Master," in which he stated he would swim the whole ocean to reach Ninjago City from the Dark Island.
**Ironically, in Hawaiian, Kai's name means "ocean" or "ocean water."
**Despite his apparent aquaphobia, Kai showed no signs of his fear during the course of Seabound.
***However, it is possible Kai has overcome his aquaphobia at some point between Possession and Seabound.
*He considers Lloyd to be like a younger brother. As of Season 5, Kai also becomes somewhat of a guidance figure to Lloyd. This bond between the Red and Green Ninja can be traced to that of the same colors in Chinese mythology and culture.
**Nevertheless he dived in the boiling sea and also can swim in Season 7, when he and his sister wanted to get to Hono Mizu.
**But in the sixth episode of Decoded it is mentioned that he wouldn't be able to swim which is nonsensical since he could swim in Season 7.
*Kai appears to holster the Sword of Fire as if he was left-handed, but uses all other weaponry and tools in his right hand; this might mean Kai is ambidextrous. 
**This may have been confirmed by Season 8 because Kai uses two katanas in this season.
*Kai and the other original four ninja can only harness their Elemental Powers by being dependent on Lloyd. This may be because Lloyd shares his Golden Power with them.
**At the end of Season 8, Lloyd loses his powers. However, Kai and the other ninja retain theirs.
**This could mean that they have become more adept at using their powers without Lloyd and do not need to rely on him anymore to use them.
*Kai says he hates technology but can be seen enjoying video games and using his phone to send Chirps. His dislike may have been because he was not used to it growing up as a child. He may have learned to adapt.
**He is similar to Krux since both have a hatred for technology, and are the oldest sibling.
***However, unlike Krux, Kai has shown to grow out of his hatred of technology and learned to enjoy them (such as playing video games and using his smart phone).
*The website states that he is often one of the leaders of the group,.https://www.lego.com/en-us/kids/characters/ninjago/kai-eec9471c9daa4ec9a735fd748c52d428 Though he was never officially considered a leader in the show, he did often take charge in the earlier seasons before Lloyd took the mantle.
*He had freckles when he was younger, as seen in "A Time of Traitors" and "Pause and Effect." However, they were not present when he was temporarily turned into a child along with the other ninja in "Child's Play."
*Tommy Andreasen said he did not think Kai uses hair gel to maintain his appearance.https://twitter.com/TommyAndreasen/status/860263906777976832 This makes sense considering Kai and Nya came from a small, poor village that most likely did not have hair gel and his hairstyle was already spiky before he became a ninja.
**However, Tommy Andreasen later answered a question saying the brand of hair gel Kai uses is a real-life brand, "Dapper Dan."https://twitter.com/TommyAndreasen/status/972364767733125120 (link missing context)
***Ian Hanlin, voice actor for the NEXO Knights character Lance Richmond as well as characters in Ninjago, has said that Lance also uses the same hair gel.https://www.youtube.com/watch?v=YXLuL9051EQ&t=590s
*He and Zane are currently the only ninja to have their Golden Techno Robe variant as a physical minifigure.
**The Golden Techno Robe Kai figure is in the Ninjago Toys "R" Us Bricktober pack for 2017.
*Kai once forged a weapon known as a Swingana, being half yo-yo, half sword. It was not a big success.https://web.archive.org/web/20141028220343/http://www.lego.com/en-us/ninjago/characters/rebooted/kai
*Kai singed his eyebrows off with the Sword of Fire once, but nobody noticed because he drew them back on with black marker.
*While Kai was not experienced with the Staff of Elements which got him corrupted, he was wise at using the elements against Chen's army.
*After Kai and Nya's parents were kidnapped by Krux, a babysitter named Mrs. Grumbmiller was hired to take care of them, but Kai and Nya would call her Madam Revenge because she made them go to bed early.
*Kai is the second ninja to solely lose their powers due to someone absorbing them, the first being Lloyd.
**He recovers them in "Fire Maker," albeit in a weak state, and overuse of it can weaken Kai.
**He fully recovers them in "Awakenings," and kills Boreal with them.
*Kai has been the mascot of most Ninjago waves, as he was the mascot of the sets from the pilot, Tournament of Elements, The Hands of Time, Legacy, Secrets of the Forbidden Spinjitzu, and Dragons Rising, Season 2.
**However, Kai's eyebrow notch is absent in his pilot and Legacy mascots.
*Kai is the only character to appear in all Ninjago: Legacy Wave 3 and 5 sets.
*Kai is the only one out of the ninja who has an avatar in Season 12: Prime Empire that does not have triangle markings on his avatar body.
*Kai is tied with Jay to have worn every suit, with the exception of the gear Zane, Lloyd, Nya, and Jay wore in Seabound. Nya and Lloyd did not wear various earlier suits, having joined the ninja team later; Zane did not wear the or ; and Cole did not have an variant in the show, and Jay did not wear his suit in Dragons Rising Season 1.
*In the "Journey to Mastery" video series on LEGO.com, Kai's journey to mastery is primarily courage.https://www.lego.com/en-us/kids/videos/ninjago/kais-courageous-journey-to-mastery-0a5ba12fe41fa93ff661bdb94c751664 (link unavailable)
**Besides the clip from "Superstar Rockin' Jay," all the clips used are from before Season 8.
*Kai is portrayed as the focus character of the sets for Firstbourne, the Destiny's Wing, the Stone Mech, and Heatwave, despite not being specifically connected to any of them in the show.
*According to Tommy Andreasen, it is possible that when Ray and Maya disappeared, Kai and Nya were cared for by their friendly neighbors, whom Wu asked for.https://twitter.com/TommyAndreasen/status/965845712679432192
*Kai was the last ninja to have stayed human for the duration of the original series, with him brielfy turing into a crystal zombie in "Roots"; Zane is a Nindroid, Jay temporarily changed into a Fangpyre in "Once Bitten, Twice Shy," Cole was transformed into a ghost from "The Temple on Haunted Hill" through "Day of the Departed," Lloyd is part Oni and dragon, and Nya merged with the Endless Sea in "Nyad."
**He is the only member of the original four ninja to not be corrupted by Dark Matter during Rise of the Spinjitzu Master.
*He appeared as a Minecraft skin in the set 21160 The Illager Raid from LEGO's Minecraft theme.
**This is possibly because Season 12: Prime Empire is focused on a video game, and Minecraft respectively is a video game.
**The suit Kai wears in this set resembles his .
*He is similar to Zuko from Avatar: The Last Airbender, because they are both teenagers with dark brown hair and a scar over their eye, they can control and create fire, at least one of their parents (Maya and Ray for Kai, and Ursa for Zuko) was lost in their childhood and later found, both have a younger sister (Nya and Azula), and both learn to control their anger over the course of the series and realize their original goal is the wrong path. He also worked at a tea shop, lost his powers and regained them through a dragon somehow, wields twin blades, and is friends with a prophesied legendary hero who has the ability to wield multiple elements (Lloyd and Aang).
*According to Tommy Andreasen in 2017, Kai is probably the ninja with the least development throughout the series, though he did have significant development in Rise of the Snakes, Tournament of Elements and The Hands of Time.https://twitter.com/TommyAndreasen/status/864606224125489156
*According to Tommy Andreasen, if Kai was a YouTuber, his videos would be bad dating tips.https://twitter.com/TommyAndreasen/status/975110111591985157
*According to Bragi Schut, if Kai had a secret hobby, it would be practicing one-liners in the mirror.https://twitter.com/bragischutjr/status/1413669849935618048 Jay was previously seen doing this before his date with Nya in "Once Bitten, Twice Shy" as well.
*The reason Kai did not react to Nya's sacrifice like Jay is, according to Tommy Andreasen, because "People respond in unexpected ways to grief and shock. You'll learn [through] life."https://twitter.com/TommyAndreasen/status/1485037564033748995
*During his time in the Kingdom of Madness, Kai gained a fondness for Cragling mud.
*Kai was the first of the Ninja to learn the Rising Dragon technique and Kai is currently trapped in the Nether-Space with Bonzle, which implies that Kai could be the one who defeats a major antagonist.
==Videos==
Meet Kai, Ninja of Fire!
LEGO® Ninjago—Venomari
The story of Kai - LEGO Ninjago - Character Spot|Rebooted Character Spot
Kai - LEGO Ninjago - Character Spot|Tournament of Elements Character Spot
The Way of the Ninja - LEGO Ninjago
Kai - LEGO Ninjago - Meet the Ninja - Character Spot|Hands of Time Character Spot
Meet Kai, Luke Cunningham, Dareth and Cole - LEGO NINJAGO - Character Video|Sons of Garmadon Character Spot with Cole, Dareth, and Luke Cunningham
Kai’s Courageous Journey to Mastery - NINJAGO Character Trailer
Kai- The Charmer - NINJAGO Character Trailer
Kai- Always Fighting With Courage - NINJAGO Character Trailer
==Gallery==
==Translations==
==References==
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