Popi stands as Memole's closest companion among the extraterrestrial inhabitants from the planet Riruru. He actively joins Memole and other village children on adventures, frequently exploring the human world, particularly Marielle's residence. Demonstrating a protective and vigilant nature, Popi often acts as Memole's guardian during these explorations, though his protective instincts sometimes clash with a notable stubbornness, causing occasional friction within the group. His family background includes a father recognized as a skilled violin craftsman in the Riruru community. Functioning as a reliable core group member alongside Memole, Popi is regularly seen with characters like Lupang and Pi during missions and daily activities within their forest settlement. His role and involvement remain consistent throughout the series' depiction of the Riruru villagers' experiences on Earth.