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The Dojo Destroyer (道場破り Dōjō Yaburi?) is a huge man who specializes in challenging various martial arts dojos. His real name is never mentioned. When victorious, he takes the defeated dojos' signs. His fighting style actually uses the signs he has taken as weapons in the duels. A combined effort of Ranma Saotome and Akane Tendo manages to defeat him.
In the manga, the Dojo Destroyer wore a white gi, had yellow skin and almost never spoke, fighting silently and restlessly. In the anime, however, he was a dark-skinned man wearing a green gi, and was much more talkative, boasting about his past fights and taunting his opponents. He has a cameo appearance in Big Trouble in Nekonron, China as one of the larger characters seen pursuing Happosai, Ranma, and Akane.