Jackie Chun is a fictional character in the anime series Dragon Ball. Serving as an alter ego for Master Roshi, Jackie Chun disguises himself to participate in the World Martial Arts Tournament and teach Goku and his friends the value of constant self-improvement. He is portrayed as a wise and powerful martial artist who pushes the main characters to work harder and not become complacent. Chun's comedic personality and martial arts prowess make him a memorable figure in the series.