animation - I want an already rigged game character (Both Deform and Control) to be able to fall apart/be animated in pieces, and still be usable in unity - Blender Stack Exchange
armature - blender bones are not working in unity - Blender Stack Exchange
Unity - Manual: Using Blender and Rigify
Blender to Unity rigging - Rigify integration issues? — polycount
My Blender rig won't import properly into Unity. Help me, please. : r/Unity3D
Model and Rig Blender to Unity – TheCell's Blog
Blender 2.8 to Unity - Armature, Weight Painting, Animation, & Blend Trees — Immersive Limit
Unity - Manual: Using Blender and Rigify
I Uploaded a Sample Armature That is Made to Work with Unity's Humanoid Rig : r/Unity3D