How many people have deduced Batman's secret identity?

I've seen DVK's question How many people who weren't superheroes did Batman reveal his identity to?, and I recently began playing the Arkham City game, and the two combined made me wonder just how many people have independently determined that Bruce Wayne is Batman.

Because I know this is a potentially gigantic list, given how many different adaptations of the Batman story there have been over the years, I'm including a few some restrictions:

1. Comics only. No video games, television shows, or movies. No restriction on eras, so if somebody figured it out in the Golden Age and the knowledge was retconned out of their brain, they still count.


2. Main continuity (of the era) only. "What If?" sort of storylines, Elseworlds for example, don't count


3. They can't have used super powers to figure it out, other than super intelligence; powers of deduction only. So if Superman uses his x-ray vision to peek through Batman's cowl, he doesn't count. Likewise with J'onn J'onzz reads Batman's mind


4. They must have survived at least to the end of the storyline in which they find it out. So a one-off villain who gets killed by the end of the issue (a surprisingly frequent occurrence in the Golden Age), doesn't count


5. They must be named characters. I'm mostly adding this to prevent answers like "Ra's al Ghul figured it out, so he probably told the entire League of Assassins." That may be true, but it's not really helpful

To reiterate, I'm not interested in people who Batman told. I'm only interested in people who managed to figure it out on their own, like Tim Drake.