Who is the most popular Marvel Comics character?

This is debatable as most popular can refer to several different things. My personal choice is the X-Men and of course they are a group. However to say the most popular it is probably SpiderMan or DareDevil. The corporate image for Marvel Comics is Spider-Man, having been co-created by Stan Lee in 1962 with the input and assistance of Jack Kirby and Steve Ditko. Just as Mickey Mouse is the Disney Corporation logo, but his popularity has been eclipsed, so has Spider-man's popularity at times. Other arguably more popular characters have included: The Hulk, Wolverine and The Thing. The long term answer is probably between Spider-Man and Wolverine.