thcha There is no example of an implementation of an 8-directional character in the example scenes of the spine-unity runtime, but you can see how to handle the skeleton's animation using the Animator Controller in Spine Examples/ Other Examples/StateMachine SkeletonAnimation/Mecanim Logic SkeletonAnimation View.

This scene and the example scripts that are used in the scene should be very helpful to you. (The example scripts are attached to the Hero GameObject.)