no.
Deadpool is perhaps the most famous. However there are a great many characters that have broken the fourth wall in Mravel. Some of the names include: Squirrel Girl and her companion Skippy Bullseye Taskmaster Spiderman Wolverine Weasel
Deadpool's brain regenerates causing random impulses, which also allows him to posses a profound cosmic awareness that allows him to break the fourth wall.
yes he was , in the 1980s
Atop the Fourth Wall - 2008 Marvel Team-Up 74 5-23 was released on: USA: 4 June 2012
ultimate
you can't
If you have data from Naruto Ultimate Ninja 3 on your memory card you get all the characters from that game including The Fourth Hokage.
carbon
to strengthen and modernize china
brian Lara
Depending on which ending you see, wait until after the credits. There are a few endings out there, but one shows Deadpool saying "Shhh" to the audience. Yeah, that's true. He communicates withe the audience, which you can say is breaking the 4th wall.
The fourth most abundant element in the universe by mass is carbon. The most abundant is hydrogen, then helium, followed by oxygen.