Leonardo "Ninong" Demetrio is one of the Leading antagonist from Television series of FPJ's Ang Probinsyano who was first introduced old-man syndicate leader after the appearance of Don Emilio.
He was under the human trafficking syndicate with his young minions to help regulating his plan.
Leonardo is seem to be Brainistic, God Wannabe and Ruthless, He likes abusing Animals and torturing Natures.
He is shot by Ricardo Dalisay.
He is portrayed by Ronaldo Valdez.