Lupang is a core resident of Riruru village, a settlement founded by tiny aliens on Earth after their spaceship crashed. Physically, he stands larger and sturdier than the other Riruru children, making him a reliable figure among his peers. His personality is marked by trustworthiness; he supports his friends during adventures with a generally steadfast demeanor. Key family relationships shape his background: his father is known as a thief within the Riruru community, stealing only minor, insignificant items. Lupang also has a younger brother named Pea, also called Pi or B-chan, who is a crybaby but assists group tasks due to his small, nimble size.