Does anybody know how to make character object ragdoll? I have been searching for reply to this question using google, but there is no info about.
Check out this question: https://answers.unrealengine.com/questions/24561/trigger-character-ragdoll-with-input-key-event.html
Good luck!
Since Metahumans are pretty new, here’s a step by step tutorial to make it happen 
How to create Metahuman Ragdoll physics | Unreal Engine Tutorial - YouTube