An ancient and wise master of martial arts, Roshi has accumulated great power and knowledge. Because he has lived for countless years on a deserted island with only a turtle for companionship, he is also called the "Turtle Hermit." His home, the Kame house, continues to serve as a gathering place for the good guys. Although he may appear strange, frail, and harmless, Master Roshi is indeed a great warrior. The first Earthling to ever understand how to nurture and control the Power of Light, Roshi trains Goku and Krillin in its use. It was Master Roshi who taught Goku the Kamehameha attack.