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The title character and main character of the series. While training with his father at the Jusenkyo training grounds in China, Ranma was thrown into the Spring of Drowned Girl. According with the spring's curse, he emerged as a young lady. When splashed with hot water, he changes back into a man. However, when splashed with cold water, he turns into the red-headed girl again. Martial arts is the 16-year-old hero/heroine's life. Whenever his pride is damaged, Ranma will go to great lengths to rectify the situation. He can come across as petty, overconfident, insensitive and arrogant, as he is prone to cheat or give insults, often acts out of unthinking selfishness, and is a frequent braggart. 

Source from Wikipeida