Angel stories with a heaven-earth power struggle? The first thing that springs to mind is the 'Nalini Singh' effect. Her Guild Hunter series, especially the early books like 'Angels' Blood', is foundational. It’s less about fluffy wings and more about a terrifying, feudal celestial hierarchy imposing its will on a modern world. The Archangels are essentially divine warlords, and the tension is whether humanity is a protected flock or just livestock. That dynamic of a vastly superior, often capricious power lording over mortals creates a constant, low-grade existential crisis, which is the core of the struggle.
For a completely different, almost bureaucratic take, I’d point to 'Good Omens'. The central conflict is the impending apocalypse, a joint heaven-and-hell operation, with the earth and humanity as the disputed territory. The power struggle is more cosmic and ideological, played out through celestial agents who’ve gone native. It’s humorous, but the stakes—the literal fate of the world—highlight how earth is just a pawn in a larger, frankly ridiculous, divine squabble.
Then there’s the darker, more visceral route found in works like the movie 'Legion'. Here, heaven has essentially declared war on humanity, and the last angels on earth are rebels fighting their own kind to protect it. The power struggle is outright warfare, with earth as the battleground. It strips away the pomp and gets down to a brutal, survivalist clash where the ‘angelic’ beings are monstrous soldiers. Each of these approaches scratches a different itch: political intrigue, cosmic farce, or desperate last stands.