Copy URL and paste it into any avatar field in the sims. It works as a live image link.
Type a name or word as a seed. Each seed creates a specific avatar. Use a character name to get a constant face. This is not AI. A math-based algorithm builds the image. The same word produces the same face.
Avatars are generated by DiceBear, a free open-source avatar library. No AI involved.
Most styles are CC BY 4.0.
Some styles are CC0.
Full license info at dicebear.com/licenses.