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Mousse is a long-time friend of Shampoo, though she might not view it that way. He has been in love with her for most of his life, but she finds him annoying at best. He can't see very well without his glasses, often mistaking someone for something else. He comes to Nerima in search of this "new fiance" that Shampoo has, and he stays to attempt to woo his sweetheart. Shampoo rebuked his advances when they were children and this still holds true by Amazon law, even if he manages to defeat Ranma in combat, but he remains persistent. Now a waiter at the Cat Cafe, he turns into a duck thanks to his own Jusenkyo curse. 

Source from Wikipeida