In the Dragonball series he was a highly renouned martial arts master and a master of the kamehameha, a blast of energy that was strong enough to destroy mountains. Master Roshi was the martial arts master who trained Goku in the art of the kamehameha. In the DBZ and DBGT series he starts to lose some of his signifigance. Throughout the series this incredibly perverted old man served as a comic relief with his booby magazines and his odd lifestyle.