Mr. Miyagi
In the movie, The Next Karate Kid, it turns out that in the Second World War, Mr. Miyagi’s friend Jack Pierce saved his life so Mr. Miyagi thanked him by teaching him karate. Jack Pierce taught that karate to his son and Pierce’s son taught karate to his daughter Julie Pierce. Then Julie’s father and mother died in a car accident so Julie’s grandfather Jack Pierce decided to teach her karate and then died of old age. Mr. Miyagi later teaches Julie karate so she can feel closer to her dead parents and grandfather. And at the end of the movie, Mr. Miyagi fights Colonel Dugan, the main villain and wins.