You never know who you're going to meet when out adventuring. And if you're a GM, you need to come up with those whos. Thankfully, there's items to help make things easier. Items like the Unconventional Allies RPG supplement that's up on Kickstarter now.
From the campaign:
Unconventional Allies presents a selection of NPCs that be added to existing gaming worlds and their introduction will add additional depth and flavour to your gaming experience.
Players should be mindful not to take their allies for granted, as the allies presented here are powerful individuals in their own right with agendas and plans that the players might not be privy to.
The campaign's up and over its funding goal with 28 days to go.