Mousse was raised in the Joketsuzoku (Amazon) village in China, where he trained in martial arts specializing in hidden weapons. From childhood, he was infatuated with Shampoo, but his affections were never reciprocated, as she always viewed him as a nuisance rather than a worthy suitor. His hopeless devotion to Shampoo became his defining trait, driving him to repeatedly challenge Ranma in an attempt to eliminate him as a romantic rival.

Determined to prove himself as the superior warrior, Mousse followed Shampoo to Japan, hoping that defeating Ranma would force her to acknowledge him. However, his poor eyesight, impulsive nature, and Shampoo’s unwavering disinterest result in his constant failures, making him more of a tragic comic relief character than a serious threat. Despite this, he continues to train and refine his abilities, holding on to the slim hope that Shampoo will one day accept him.

Mousse is tall and lean, with long, flowing black hair tied into a low ponytail. He wears traditional Chinese-style robes with long sleeves, which serve a dual purpose as storage for his hidden weapons. His most distinctive feature is his thick glasses, which he desperately needs due to his severe nearsightedness. Without them, he struggles to recognize people, often mistaking objects, animals, or even Ranma (in female form) for Shampoo, leading to countless humorous misunderstandings.

In his cursed form, Mousse transforms into a small white duck with his signature oversized glasses still perched on his beak. Unlike Ranma and Ryoga, whose cursed forms maintain some level of dignity, Mousse’s duck form is arguably the most humiliating, making his obsession with proving his strength even more ironic.

Mousse is loyal, passionate, and highly determined, but his obsession with Shampoo often blinds him to reality. He refuses to accept her rejection, constantly deluding himself into believing he can win her love if he proves himself strong enough. This one-track mindset leads him to reckless actions, as he often challenges Ranma without proper preparation or strategy. His overconfidence and tendency to underestimate his opponents result in frequent humiliations, yet he never loses his resolve.

Despite his stubbornness and arrogance, Mousse is not a bad person. He is capable of kindness and loyalty, especially toward Cologne and the Joketsuzoku traditions. While he resents Ranma as a rival, he occasionally works alongside him when necessary, proving that he is not entirely consumed by jealousy. However, his persistent delusions about Shampoo’s feelings prevent him from growing emotionally, making him one of the series’ most tragic and comedic characters at the same time.

• Rivalry with Ranma
  Mousse views Ranma as his greatest obstacle, believing that Shampoo only rejects him because of her love for Ranma. As a result, he frequently challenges Ranma to duels, using his extensive arsenal of hidden weapons in an attempt to overpower him. However, his poor vision, lack of adaptability, and Ranma’s superior skill result in his near-constant defeats, making him one of Ranma’s most predictable rivals.

• Struggles with His Curse
  Mousse’s Jusenkyo curse adds another layer of humiliation to his life, as transforming into a small duck strips him of his dignity and combat abilities. While Ryoga’s piglet form at least allows him to stay close to Akane, Mousse’s duck form serves no real benefit, making his Jusenkyo misfortune one of the most pathetic in the series. Though he hates his curse, it does not stop him from fighting for Shampoo’s affection, even if it means getting repeatedly ignored, rejected, or defeated.

• Devotion to Shampoo
  Mousse’s unwavering love for Shampoo remains his biggest driving force, pushing him to train harder, seek new techniques, and challenge Ranma whenever he sees an opportunity. Unfortunately, his efforts are in vain, as Shampoo consistently dismisses him without hesitation. This endless cycle of rejection and persistence defines his character, making him both a sympathetic and frustrating figure in the series.