Leo is a resident of J-ville in 2174 in The Guilt of War. He is a main character and acqaintence to Jason Black and Micheal Chiniasa, and owns their room in his pawnshop. He fluctuates the main moneyflow and despite looking like a slum, he has managed to get several trade routes from all over, including Floridian settlements.
He has a unique item he sells, the Ammo Ball. At 50 Mineral Rocks each the buyer can create 10 bullets of his or her choice. It was very popular before the sniper took over.