Spider-Man, Iron Man, Captain America, most likely one of those.
The Hulk, X-Men, Fantastic 4 and the other heroes above.
The most popular in media as of 2016 is probably Iron Man (multiple films). Others highly popular for the same reason are Thor and Captain America. But historically it has been Spider-man, the X-Men (especially Wolverine), and even the Hulk.
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The Tony Stark from Iron Man 2 is a more relatable, light hearted character than the man in the Marvel Comic. The Marvel Comic is written by multiple authors with different views on who exactly Stark is, whereas the screenplay is only acted out by one person with a single view on the character.
The mythological character Thor is public domain. The Marvel Comics character is not, but if you wanted to start your own comic with a character named Thor, as long as your Thor is distinct enough from Marvel's that the two could not be confused, then you should be fine. They'll probably sue you anyway, of course, in the hopes that you'll just give up rather than fight it.
Edward Cullen from twilight
Amber Valletta is an actress. Her most popular television role is as the character Lydia on the ABC drama "Revenge". She has also appeared in films such as Dead Silence, Gamer, and The Spy Next Door.
In 2006, The most popular name for a girl was Emma. The most popular name for a boy was Aiden.