Minifigures and their Secondary Market Value

With the blessing of the moderators on these forums, I've been granted the ability of being able to start a minifigure thread, similar to that of the "Predictions on Discontinuing Sets and their Secondary Market Value" that has been one of the most popular threads on Brickset for over a year.

I've noticed an increase of minifigure collectors on these forums, so I figure it is about time we kick start our own little thread here.

This thread is meant to discuss the many aspects of minifigures, including what people think about specific minifigures coming out in new sets, as well as previous ones. It can be any theme of minifigures, CMF, Star Wars, Super Hero, Exclusive, etc.. Whichever you have questions about or thoughts on... just as long as it is a minifigure!

I hope to see this thread take a direction of discussing minifigures as potential/current/past investments. However, I realize it's Brickset, and this thread will probably go wherever that its members choose :-)

But, with this general idea in mind, what minifigures do you all believe will be future "winners", which are being undervalued currently, and which ones in the past were overlooked and may be prepared to make a comeback? :-)