Ricardo Diaz is a significant villain for the Green Arrow in the New 52 era of DC Comics. After the death of his drug lord father, Ricardo traveled the world and trained under a man known as Richard Dragon to transform his body into a weapon. When Richard Dragon tried to teach the value of compassion, Ricardo murdered him and took the Richard Dragon name for himself. Believing that the Green Arrow had murdered his father --- which is an Arrow plot we've seen before --- he sought revenge on Green Arrow. He placed a bounty on Oliver's head -- which an Arrow version would be able to do with his $25 million -- and teamed up with villains like Danny Brickwell and Killer Moth to try and take him down.