I have always had the concept for a pre-human setting based in a world of magic and mythic fantasy where the main characters are beasts of various forms with many of the attributes people later granted to them in their primitive societies. Within this ancient story, much of what makes the characters unique is their personifications and extraordinary ability, contesting themselves against a wild, dangerous world where nothing is tamed or understood. More daringly for them, there exists tremendous powers of darkness that are dawning in the time to come, leading to a path that explains just how and why people give them these qualities, but in the current era there's no longer magic; more or less, a fantasy history setting that's primeval and tribal, if not at times grand, but leading to a time where nothing is really quite so supernatural or legendary anymore... which then becomes reality. Another vein of this, which I have tried to some extent, was a post apocalypse setting in the same idea that after mankind fell away - still present but forever broken and little more than scavengers attempting to avoid death - the beasts of the earth inherited the world and the powers thereafter. Great, unnatural powers are wielded by some of these creatures, some of whom are vengeful that they were so destroyed for so long by men, whereas others still live to serve and preserve the crumbling pieces of the past. It makes the modern ancient and puts the focus on the characters, where they live in this dark yet twisted version of reality that's been born, really reborn, out of what we do know and off into fantasy rather than truth. There's grey skeletons of city ruins, populated by places of vibrant green life and pooling waters, overgrown here and there, but others are absolutely ash, nothing but twisted concrete, steel and ambiances of suffering. Out of both, the idea is to simply play exceptional animals in a less lighthearted, more serious and somber note.