I'm sure there are hundreds of ways in which the minion of a godling might come into existence, but two methods come to mind immediately:
1) The Elevated Cultist -- A particular member of a god's cult is transformed into something not-quite-divine but not of the mortal world either.
2) The Spirit-Ally -- Untold numbers of disembodied phantoms exist in this reality and others. Those loyal to higher spirits -- our godlets for instance -- might be rewarded for their service with material bodies -- essentially vehicles to roam the world of mortals and indulge themselves in physical pleasures.
Using the format we've stuck to for godlings, send me a divine minion for inclusion in PETTY GODS. Minions will appear in their own Appendix.
Send to: flowthrake AT gmail DOT com