Humaaans - Mix-&-match illustrations of humans with a design library.
Humanotion - Free avatar pack, perfect for Notion
Avataaars Generator - A simple avatar generator
Minimal Avatars - Create minimal, unique and playful avatars for free
AVATARZ - Lovely library of diverse 3D avatars
100 Free Userpics - Collection of a hundred free userpics especially for your design projects.