Happosai
he steals panties??? 
Happosai is an old martial arts master who taught  Genma and Soun when they were young.  Taught being the emphasized word, because he used them to sack and pillage nearby towns for food, drinks and women's underclothing.  The terror of Happosai went on for months until one night, when Genma and Soun gave him some sake (pronounced sah-kay, it's kinda like rum) which he drank wholeheartedly and fell asleep.  Genma and Soun then tied him in chains, put him in a barrel, tied up the barrel, threw it in a cave, threw dynamite in the cave, put a boulder over the cave entrance, hung anti-evil wards on the boulder and held the boulder in place until the dynamite went off.  Genma and Soun then forgave Happosai for his crimes, and left him to rest in peace.
                They wish.  20 years later the boulder was hit by lightning during a thunderstorm and shattered, freeing a dark, red-eyed being from his eternal prison.  Happosai came to Nerima and ate at restaurants, leaving tabs sending the bill to the Tendo Training Hall.  Akane and female Ranma found him in the street, where he had already found a group of P.E. girls out jogging, and was clinging all over them, looking for Akane.  Akane said that she was who he was looking for, and Happosai was startled to find that he'd actually found her.  He grabbed at Ranma, who kicked him away, and Happosai cried that Akane didn't recognize him.  They brought him to the dojo, where Soun was controllably startled that he was alive, but welcomed him home.  Soun then tried to attack him, but got thrown out the window.  He then saw Genma, who was hiding as a panda, but Happosai recognized his beady eyes.  Later, Happosai told them that their scheme to destroy him had failed, and that they should have finished him off when they had the chance.  The reason he had come, though, was that he needed an heir to the Anything Goes School of Martial Arts.  Soun and Genma quickly refused, but Genma elected Ranma for the job, but (Ranma was a girl at the time) Happosai said she'd never survive his training, then cried in her chest, to which Ranma punched him away.  Genma then splashed Ranma with hot water, and told Happosai that his son was a boy, and Happosai accepted Ranma as his disciple.
                Happosai trains Ranma through indirect means, such as throwing him in no-win situations, or fighting him for intruding in his affairs.  He is an incredibly strong martial artist, more powerful than most of the characters in the entire series.  His strength is drawn from contact with women's underclothing, or women themselves if he can.  He steals panties, bras and anything else he can get his hands on, proving that he is a 110% pervert.  He isn't afraid of anyone either, but he uses Genma and Soun as flunkies to do his dirty work.

Back to the Don...Nothin' like the smell of a man to make ya sick! (cough)