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The very definition of a dirty old man, Happosai is the grandmaster and founder of the Anything Goes Martial Arts school. Genma and Soun were his original disciples, but they got fed up having to steal lingerie for the old letch and decided to try and finish him off. They were quite surprised when he showed up many years later to make them miserable and find a successor in the Art. Unfortunately for Ranma, he was the incorrigible old freak's choice. He is a strong martial artist with but one weakness: bras and panties. Happosai is so obscenely addicted to his perversion that he suffers from withdrawal if he goes without them for an extended period. It seems as though he always shows up at the most inconvenient moments.