As I thought, there was actually a ragdolled version of it (and not like that guy has said about that jojo models can be ported just as props...).
Now the model is no longer a prop, but a ragdoll (originally ported to XNALara by https://www.deviantart.com/killermemerino , and as usual ported to Gmod and SFM by me).
The features are:
*bones;
*original rigging (or at least the one that was exported to XNALara);
*flexes (for both the face and the horse one) made by me;
*animations (the ones that I could put);
*own physic.

Initial addon creation.