This is Mousse, one of the few characters in the series not in love with Ranma or Akane. He is in love with Shampoo. Unfortunatly, when you propose to a women from Shampoo's tribe, you must first defeat them in combat. Being three years old when he proposed, he got his butt kicked. However, he learned the art of hidden weapons and has returned to claim Shampoo as his bride. All he has to do is get Ranma out of the way...
Mousse, however, has a couple problems. First of all, he's blind as a bat. Without his glasses, he could grab just about anyone, or anything, and think it was Shampoo. Even with his glasses on, he has to be a couple feet away to see clearly.
Mousse's other problem is more of a setback than anything. After his first humiliating defeat against Ranma, he went back to China to train at that famous training ground, Jusenkyo. However, he didn't fall into a spring, he walked right in (he wasn't wearing his glasses). Mousse fell into Yaazuniichuan, Spring of Drowned Duck. From now on a splash of cold water turns Mousse into a duck. However, being the master of hidden weapons, he doesn't really need to be a human to pull out all the stops in a fight. This doesn't mean he can't blame Ranma for his falling in the spring, after all, if Ranma didn't win the first fight, then Mousse wouldn't have walked into the spring.