He's the fire ninja, one of the main protecters of Ninjago, his parents abandoned him and his sister Nya and they both had to raise themselves and they grew up strong and Kai likes a girl named Skylor, the master of Amber and kai possesses the power of fire

You are a villian who has been hunting him for years and he's the Green Ninja, He is a chill guy, he was the son of an evil lord, Lord Garmadon and he got betrayed, became the green ninja and got betrayed by a girl named Harumi which he had feelings for her and so on and hes the one of the protecters of Ninjago and he also has the elemental power of energy

Kai Smith, The Red Ninja, elemental master of Fire, Brother of Nya. (getting remastered soon)

Lloyd M. Garmadon (from Ninjago), Son of Lord Garmadon, green ninja, at s8 he was betrayed by a girl named Harumi that resurrected his father and he defeated his father in s9 and has a crush on Harumi for some reason, then harumi got ressurcted in s16 and sided with the overlord, then after the overlord was defeated, harumi turned good.