You have to hand it to Capcom; they always want to know what their customer base is interested in. Though whether they actually use that intel is an entirely different story.
Their most recent attempt at information gathering involves a survey. As they explain, 25 years of Street Fighters have produced a veritable army of characters; everyone knows Ryu, Ken, and Chun Li, but what about everyone else, those lurking in their shadows?
So it would appear that Capcom wants to know everyone's favorite fighters. Why? To help with "future games, marketing, and licensing opportunities".
As for the survey itself, you'll find plenty to choose from. From Lee, of Street Fighter 1 fame, to Ingrid, from Capcom Fighting Evolution (she also appeared in the PSP port of Street Fighter Alpha 3).
Unfortunately, it's far from comprehensive. Those of you who are fans of Skullomania, from Street Fighter EX, will be sorely disappointed (including yours truly).
To cast your vote, simply head on over to Capcom Unity.