One common theme is the clash of cultures. Naruto's world is full of ninjas, honor, and complex politics, while minions are all about fun and chaos. So when combined in fanfiction, there's often a theme of how these two very different cultures interact. For example, how the minions' carefree attitude affects the more serious ninja in Naruto's world.
Well, the Minions have a rather mysterious origin. They seem to have emerged from some unknown source long ago. Their main goal has always been to serve someone evil or at least someone with a lot of power. They have a natural inclination towards mischief and chaos. Throughout their origin story, they've interacted with various beings, from prehistoric animals to humans. Their evolution in terms of behavior and appearance has been shaped by their experiences with these different masters. They're always getting into trouble, whether it's accidentally blowing up a castle while trying to help their master or causing general confusion wherever they go. But that's what makes them so fun and beloved.
One key element is their need to serve a master. Another is their evolution from an unknown origin to the cute, yellow beings. Also, their language development.
One popular 'rifts minion war novel' could be 'Rifts: Minion Wars - Blood and Thunder'. It delves deep into the intense battles between different minion factions in the rifts universe. The story is filled with action, magic, and complex characters.