Mousse is the vision-impaired suitor of Shampoo. Even though Shampoo has shown no interest in him almost their entire lives, Mousse continues to fight for the attention of the woman he loves. He blames Ranma for Shampoo's dislike of him, and is constantly at odds with Ranma.

Mousse is able to combine aspects of slight-of-hand magic techniques with his martial arts, allowing him to pull many weapons out of his oversized sleeves.

After Mousse's first loss to Ranma, he took a training voyage to Jusenkyo, where he accidently walked into the "Spring of Drowned Duck". Mousse also blames Ranma for his curse, since he believes that if he hadn't lost he wouldn't have needed the extra training to beat Ranma. Mousse forumulates plan after plan to try and break Ranma's hold over the woman he loves, but nothing seems to work.