Kai (LEGO Ninjago, seasons 8-12)

Kai is one of the main 6 ninja of . He is the red ninja of fire, and Nya, the master of water's older brother. Unfortunately, during Seasons 8-12, he suffered flanderization and reverse character development.

Bad Qualities (Seasons 8-12 only)

 * 1) He went from being a developed and courageous ninja to an annoying character who tries to be comical for no reason.
 * 2) In Season 11, he constantly berates his teacher/mentor, Master Wu, for Aspheera taking his powers away, because he's the one who she wants, when he's had his powers taken away because of Wu's history with a villain BEFORE, and they were well within volition of stopping Aspheera from coming out of the tomb after Zane warned them, as seen here. And while you could argue that it was because he felt like an average person without them, he still has his years of combat experience, ninja training and Spinjitzu!
 * 3) Also, Even though he admitted he didn't need powers to be a hero at the museum, 3 episodes later that "development" got all flushed away after he found out that Wu had history with Aspheera.
 * 4) He's incredibly cocky. While yes, he was in Seasons 1-7, he developed over time and it became less prevalent. Now, it seems as if it's his main trait.
 * 5) His leadership trait (showing in scenes like his speech about stopping the Devourer without Wu in Season 1, or variously regarding Zane in Season 4) is essentially thrown in garbage in favor of his tryhard comical attitude.
 * 6) In Season 12, he's really annoying as he constantly uses sarcasm to an annoying degree and is whiny.
 * 7) As said in BQ #1, he's always trying to be a comic relief character like Jay in these seasons, which is annoying because Jay's actually funny.
 * 8) Addressing the elephant in the room(for Ninjago fans), in the Season 8 finale, he hesitated possibly giving up his powers to save Lloyd just because "They would need their powers to stop Garmadon", which completely goes against his character in the previous seasons, where he has a strong relationship with Lloyd and would give up anything to protect him.

Good Qualities

 * 1) He managed to recover from his flanderization in Season 13, unlike Dareth.
 * 2) The scene in Season 10 where Kai comforts Nya regarding Cole's "death", was a very heartwarming scene and arguably one of the best moments in the Oni trilogy.
 * 3) The scene in season 9 where he teaches young Wu a lesson about confidence could be considered good to some people.
 * 4) He reforged the Golden Weapons, aiding in defending Ninjago from the Oni.
 * 5) He's still defends Ninjago from threats.
 * 6) His redesign is essentially the movie one merged with his original one, and it works well.

Trivia

 * Kai's voice actor, Vincent Tong, is the same one who voices Flash Sentry from My Little Pony: Friendship is Magic.