The worst thing about the end of the world is we did it to ourselves. Isaac Thoma lived to see the last handful of survivors defeat the demonic champion. He is now alone, his past in ashes, the last and most powerful human on a blighted Earth. But what if he could go back?

Hurled back in time, Isaac has one chance to change it all. A chance to warn humanity of their impending doom. A chance to stop the [System] before shortsightedness and lust for power can render humanity extinct. Facing malign deities, demonic hordes, and the unstoppable march of human greed, Isaac will give his all to prevent the end that has already happened on the day the world became quantified.

Is it snark if you're a dragon?

Nico, a young dragon of barely fifty, is rudely chased from his home by a group of murderous adventurers. Of his entire clutch, only he and one sister remained, but now he is alone. Isolated and hungry, Nico’s magic awakens, bonding him with Cami, a brave young woman.

To hide from the adventurers’ pursuit, Nico takes on human form. However, once they discover that both he and Cami have magical abilities, they are required by law to attend the Imperial Academy.

Of course, he has to hide his true nature, which isn't always easy given a dragon-sized ego.