One thing about Green Arrow that's true in any medium is that he really doesn't have much in the way of a rogues gallery. He simply dips into the same pool a lot of street-level superheroes seem to share. Aside from Merlyn and Deathstroke, one of the only recurring villains to really be associated with Oliver Queen is Count Vertigo. He's a natural nemesis for our hero. After all, Ollie's skills as hero depend entirely on his concentration and focus. Vertigo can rob him of those skills with a glance.