The one who we call Gun-Z breathes martial arts and more specifically judo since childhood. He actually learned how to throw his opponents at the same time he started learning how to read and write. Very intense and strong physically, Jonathan has the fighting spirit and has only one idea in mind : destroy his opponents. However, he shows them a profound respect which is required in the tradition of judo in which he grew up. Winner of the first ever fight of the SLF in 2004 against Rémi Gélinas, he is certainly one of the most exciting fighter to see in action. Gun-Z has participated in the creation of the SFL rules and was the first ever lightweight champion of the SFL.