[spullara]

There are AI rigging tools in development (some prototypes have been released).

https://actorcore.reallusion.com/auto-rig/accurig

[echelon]

But the sculpts also have to be good (eg. topology) and have to fit the rigs.

This is going to be a longer slog to solve than image generation (though I'm sure we'll get there in a few years).