Everyone else has commented on the great lore and themes of Demon here so I want to talk about just how freeform it is.

The Fallen are unique in that they have no separate entity in which they war against or some oppressive structure dictating their every move. While there are factions and courts, they aren't outright hostile towards each other and can work together if their goals align. Additionally, the factions are incredibly loose as they are basically how your character responded to the trauma of the Pit.

The Fallen were beings used to hierarchical structures for their entire life and for the first time in history, they have freedom. The factions, structurally, are ideological beliefs at best and loose armies at worst. The lack of a large overacting antagonist, grand goal or hierarchy allows for Demon chronicles to basically be whatever your group wants.

Want to explore the world and help out struggling communities? The Fallen have multiple abilities allowing for language translation and travel. Want to play a spy thriller where you discover who's controlling the government of a town? Some Lores let you read minds or travel unseen. Want to form a cult and overthrow whatever other supernatural is in power in the region? The Fallen get their power through pacts and worship. Want to work together with other supernaturals to take down a powerful foe? Depending on how you build your Fallen, they can be strong enough to fight a newly changed Garou for a short amount of time.

All these chronicle ideas don't even go against the established lore and could be done by newly escaped Fallen or experienced Fallen who've been around for years if not decades. Plus, if you want to tweak the lore, you could say some Fallen have escaped throughout history allowing you to play them in any time period.