What does it mean in Rurouni Kenshin when Megumi Calls Kaoru 'Potato Girl'?

In "Rurouni Kenshin," when Megumi refers to Kaoru as "Potato Girl," it's a playful and somewhat teasing nickname that highlights Kaoru's simplicity and down-to-earth personality. The term reflects Megumi's lighthearted rivalry and camaraderie with Kaoru, emphasizing their contrasting characteristics—Megumi being more sophisticated and experienced, while Kaoru is straightforward and earnest. This nickname adds a layer of humor to their interactions, showcasing their friendship amidst the series' more serious themes.