Though he does not appear to physically age, Mr. Popo is very old, having served Kami, the Guardian of Earth, for hundreds of years. He also served Kami's predecessor, as well as the Guardians of Earth into the distant past. Being the loyal and faithful servant that he is, his vocation covers a wide variety of areas, such as tending to Kami's palace and grounds, keeping the Lookout clean, training Earthlings and other creatures to deal with especially dangerous enemies of the planet