The amnesia plot is speedrun in Ranma 1/2 Episode 12, the season finale of the MAPPA adaptation. Shampoo (Rei Sakuma) remains the major foil to both Ranma (Megumi Hayashibara and Kappei Yamaguchi ...

Using food-based techniques ... a child by her master, Cologne, Shampoo is proficient at many martial art forms and is her villages female champion. While Ranma outclasses her, it is not a stretch ...