Guillermo Barrera

Guillermo Barrera is a mercenary and an assassin, mostly operating abroad.

Biography
Barrera is hired by China White to kill Malcolm Merlyn, under the order of Moira Queen. The moment he arrives in Starling City's airport with his helicopter, he's confronted by the vigilante, and after a brief fight, he's killed. Hacking his phone, Felicity Smoak identifies his target.

Abilities and equipment
Barrera showed to be quite a good fighter, fighting almost to an even Green Arrow. He uses many kind of blades, and deploys in combat both hand knives and throwing knives.

Trivia

 * In the comics Guillermo Barrera is the supervillain Brutale, a recurrent enemy of Nightwing.