I once thought about possible stories for Chrono Break (I'm sure every Chrono fan has), and one idea I came up with was that humanity could become the "new Lavos", now that the original Lavos is dead. In the future, humans explore space, they one day discover a planet with living beings, they colonize it and start making experiments for their own benefit but to the detriment of the inhabitants... exactly what Lavos did on the Chrono planet, just at a smaller scale.
Mmmh, actually, this makes me think about "The Time Machine". In the movie (probably in the novel too... I didn't read it), the protagonist time-travels millions of years in the future and meet 2 alien-looking species: the frail Elois and the monstrous Morlocks (who eat Elois). Apparently, both species are just very evolved humans, Elois being evolved from the upper class and Morlocks evolved from the working class.
Similarly, maybe humans and Lavos are from the same evolutionary path. Lavos could be a very evolved form of the human species (I'm assuming humans on the Chrono planet are not the only humans in the universe)... if humans keep on being selfish and destructive to their environment, at least. In other words, Lavos is an extreme vision of the bad side of humanity.