system
Given the following post, respond as if you're commenting on Reddit:
human
[Dragon Ball Z] So I get that Popo is the strongest life form. What is he? What's his story?
gpt
Taken from kanzenshuu.com, which derives its material from official guides and from an in-depth research of the source material:

"One method by which the gods of the afterlife govern the Living World is by dispatching personnel to each planet. This is in order to oversee and protect a planet’s sentient life-forms. But beyond this, the main goal is to stimulate an immature sentient species’ growth, guiding it towards the greatest happiness. However, these personnel dispatched to each planet often do not become that planet’s god, but instead serve as a sort of attendant for the god. Instead, an appropriate person from among the planet’s sentient life-forms is selected to serve as god. The principle seems to be that a species’ fate should be entrusted to the species itself, and so the dispatched personnel are only permitted to act in a purely subsidiary role. In fact, Mister Popo and Karin were dispatched from the afterlife to Earth and devote themselves to supporting whoever is selected as god.
 — “Dragon Ball Daizenshuu 7: Dragon Ball Large Encyclopedia” (p. 37)"