Master Roshi Character Facts

Master Roshi is an ancient and wise martial arts master, and the first character to wield the trademark Kamehameha. Though he seems frail, Roshi is actually a mighty warrior. He trained Grandpa Gohan, Ox-King, Goku, Krillin, and Yamcha. Master Roshi is both the archetypal wise old man and a perverted old man, the latter being typical of shōnen manga. Sometimes, he gets cranky, which further provides comic relief. His companions are usually Oolong, Turtle, and Launch. His home is Kame House, a shack on a small isolated island which serves as a gathering place for his friends.
Master Roshi is bald, with a thick white fu manchu mustache and beard. He is almost always seen wearing his trademark sunglasses; after the fight against Majin Buu, Master Roshi left his old sunglasses and went to more futuristic ones. He wears beach clothes or a martial arts suit and a Turtle Shell on his back. He usually wields a walking stick.
Master Roshi, the younger brother of Fortuneteller Baba, was a martial artist trained by the great Master Mutaito a few hundred years before the beginning of Dragon Ball. He was the first one to climb the extremely tall Korin Tower and train under the legendary Korin. It took Master Roshi 3 years to catch Korin and obtain the Sacred Water, which was rumored to tremendously increase one's strength and speed.
Master Roshi can also increase his energy and achieve his final and only stage. In this form, his appearance changes dramatically, with an enormous increase in muscle mass and strength. In this state, he can perform many ki attacks at their maximum potential (most noticeably the enhanced MAX Power Kamehameha). 
Roshi uses this form when he puts out the fires on Fire Mountain, when he destroys the Moon as Jackie Chun, and when he transforms to fight Broly but backed down at the last minute (mostly because he was too drunk to even focus).