Hey, what's with all those kernelsprites roaming around? How did they appear? And will there be enough to revive all the dead characters?

The kernelsprites belong the the Alpha kids. In the post-retcon timeline Tavris, Fefeta, and Erisol sprites were never prototyped so there were 3 empty ones. Vriska prototyped Tavros in one of them so now there’s Tavrosprite, Jaspersprite prototyped dead pre-retcon Rose and himself in another, and the third one is still empty but it probably won’t be for much longer.