How do you create character rigs like seen in this game? Zombie Recoil?

Ever heard of skinned meshes? And if you do not know how to rig there are 2 ways. Rigging with a roblox plugin, or blender rigging with bones.

What is the plugin? I’m very interested in how to accomplish this?

RigEditor. I am not sure if you can even use skinned meshes with this but I advice you use blender. As skinned meshes have a huge impact on anything. Go ahead and look it up to see what it does