Dynamic rigidbody interactions

To let your character push and be pushed by dynamic rigidbodies, enable the SimulateDynamicBody option in your character's authoring component.

When SimulateDynamicBody is enabled, the character applies force on itself and other rigidbodies to imitate the behavior of a true dynamic rigidbody. This uses the Mass property of the character's authoring component to simulate collision mass ratios.

SynchronizeCollisionWorld

When dealing with a character that can push or be pushed by other rigidbodies (kinematic or dynamic), you might want to add a PhysicsStep component to an entity in your scene, and set SynchronizeCollisionWorld to true. This ensures that the CollisionWorld that the character update uses for physics queries is updated after the physics systems make the rigidbodies move. The result is that enabling SynchronizeCollisionWorldremoves some slight visual lag between the character and the object it pushes.