Kai (Ninjago Seasons 1-7, 9, 13-present)

Kai is the current Elemental master and Ninja of Fire, Nya's elder brother, and Ray and Maya's son and eldest child. 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.

Why He Rocks

 * 1) He is the main character of the pilot
 * 2) he got a shared season in season 7
 * 3) he cares about protecting his friends and family like when he went to save his sister Nya in the pilots, when he saved Lloyd from the volcano in season 1, and how he also protects master Wu
 * 4) His relationship with Skylor is memorable, and might be touched on in a future season
 * 5) He saved his parents from Acronix and Krux in season 7
 * 6) In season 5, Kai tried to help Lloyd fight Morro, who had been possessing Lloyd at the time
 * 7) His design looks amazing

Bad Qualities

 * 1) He was flanderized in seasons 8-12
 * 2) he can be cocky at some times.