Yes, you can use a Spine skin as a ragdoll body. The SkeletonRagdoll2D component in Spine creates ragdoll physics components for all bones, which might include unused ones if you have multiple skins. To optimize this, you can create a specific skin that only includes the bones you want to use for the ragdoll. This way, you can ensure that only the necessary bones are included in the ragdoll setup, reducing the number of unused joints and colliders. This approach allows you to have more control over which bones are used in the ragdoll physics, making it more efficient.

@fshakhverdiyev SkeletonRagdoll2D uses startingBoneName and a stopBoneNames list to control which bones to include in the ragdoll. You might rarely want to include all active bones, even of a limited active skin.

Note that the SkeletonRagdoll2D component is just an example component, you might want to write your own custom component based on it if you have different needs (derived from the class or copied and modified accordingly).

fshakhverdiyev But can i use another skin for ragdoll ?

You could write your own modified version of SkeletonRagdoll2D and do that, yes.

fshakhverdiyev I can create skin in spine editor with constraints and use in unity as a ragdolled body. Is this good way ?

I'm not sure I understand what you mean by this sentence, especially by "with constraints". If you meant Spine's Physics Constraints, then no, please note that a Physics Constraint is not colliding with anything, for example not with Unity's colliders of your scene.

If you meant other constraints to then control your primary bones: you could do that, this could be a nice setup.

If you mean whether you create a skin just to assign bones which shall be included in the ragdoll as skin-bones: you could do that as well, but I would not go that far just to define a set of bones.

Thanks for the clarification.