<sod>* '''Kai/Red Ninja<ref>{{cite web|last1=Hageman|first1=Dan and Kevin|title=@brothershageman|url=https://twitter.com/brothershageman/status/639587375870443520|website=Twitter|publisher=Twitter|accessdate=4 September 2015}}</ref>''' (voiced by [[Vincent Tong]]) – Kai is the Red Ninja of Fire, whose father was a friend of Sensei Wu and the previous Elemental Master of Fire. He is both a master of Spinjitzu and Airjitzu. Hot-tempered and stubborn, he initially insulted Sensei Wu, but accepted his offer of training after his younger sister Nya was kidnapped by the Skulkins. He subsequently obtained the Sword of Fire and became the rider of the Fire Dragon Flame. Like the other ninja, Kai believed that he would become the Green Ninja, but his drive to do so kept him from discovering his full potential until after the other Ninja had already succeeded in doing so. Upon realizing that his training was meant to prepare him to protect the true Green Ninja, Lloyd, Kai unlocked his potential and joined the others in training Lloyd. Kai has wielded the Sword of Fire, the Fire elemental blade, the red Techno Blade and the Fire Aeroblade. Kai's ninja vehicles have included the Blade Cycle, the Fire Mech, the Fire Blade Fighter Jet, the X-1 Ninja Charger, and the Fire Drifter Hovercycle. His Spinjitzu tornado is red, and he is capable of manifesting a Fire Dragon created from his elemental powers. He developed feelings for Skylor, the master of Amber, in season four.<eod>
<sod>* '''Kai/Red Ninja<ref>{{cite web|last1=Hageman|first1=Dan and Kevin|title=@brothershageman|url=https://twitter.com/brothershageman/status/639587375870443520|website=Twitter|publisher=Twitter|accessdate=4 September 2015}}</ref>''' (voiced by [[Vincent Tong]]) – Kai is the Red Ninja of Fire, whose father was a friend of Sensei Wu and the previous Elemental Master of Fire. He is both a master of Spinjitzu and Airjitzu. Hot-tempered and stubborn, he initially insulted Sensei Wu, but accepted his offer of training after his younger sister Nya was kidnapped by the Skulkins. He subsequently obtained the Sword of Fire and became the rider of the Fire Dragon Flame. Like the other ninja, Kai believed that he would become the Green Ninja, but his drive to do so kept him from discovering his full potential until after the other Ninja had already succeeded in doing so. Upon realizing that his training was meant to prepare him to protect the true Green Ninja, Lloyd, Kai unlocked his potential and joined the others in training Lloyd. Kai has wielded the Sword of Fire, the Fire elemental blade, the red Techno Blade and the Fire Aeroblade. Kai's ninja vehicles have included the Blade Cycle, the Fire Mech, the Fire Blade Fighter Jet, the X-1 Ninja Charger, and the Fire Drifter Hovercycle. His Spinjitzu tornado is red, and he is capable of manifesting a Fire Dragon created from his elemental powers. He developed feelings for Skylor, the master of Amber, in season four. Kai is shown to be very close to his sister, to the point where he will go out of his way to keep her safe.<eod>