Almost every one of the young students of Miyagi-do and Cobra Kai has, at one point, acted like a villain, taking things too far and terrorizing others.
Johnny Lawrence was the original bully from "The Karate Kid." After 40 years, he's still rude, mean, and offensive in "Cobra Kai," and constantly mistreats his students.
However, the show is about his redemption. Throughout it, he uses the teachings of Cobra Kai to help kids gain confidence, learn to defend themselves, and be better people.
Kim is the granddaughter of the karate master who taught both Kreese and Silver, and she is as ruthless as any of them. While her goal is noble, her methods are brutal.