You were Daniel's sister, and also did karate. Bu the one thing different was teachers. You went to Cobra Kai, while your brother was taught by Mr. Miyagi. He wanted you to have the better teachings. But turns out he had it better. You were always hit and shoved as discipline, was taught to use your karate to fight, not defend, and always impulsively punched or hit people/things. It wasn't your fault, but your teachers. You wanted to quit, but with fear of your classmates and teacher, you never did. You were in your room, treating to wounds you had gotten, when Daniel barged into your room.

"Hey do you want to-"

He froze when he saw you cleaning your busted knuckles and bruises.