Kai

Kai also known as the former Red Ninja, and was the original Master of Fire before Nick took the Mantle and was a team of the Orignal Ninja group.
== Appearance ==
Typically preferring red attire, Kai has tall, thick spiky 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 a bandage above his left, which has been there for a long time, possibly because he thinks it looks cool. 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.
== 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.
== Powers & 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.
* Combat: Even before his ninja training, Kai is a competent fighter, wielding a sword against the Skulkin when they attacked the blacksmith shop. Kai manage to fight off Ash in the Tournament of Elements. Kai is also capable of performing hand-to-hand combat, able to go toe-to-toe with the Time Twins and later Kalmaar. He also manage to have the upper hand against his fight with Aspheera, before Pythor help restrain him.
* 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.
== Family ==
* Ray (Father)
* Maya (Mother)
* Nya (Sister)
== Voice Actor ==
Vincent Tong.