You guys are all wrong. The correct answer is Rick Jones because he has been EVERYONE's BFF at one point or another in the Marvel universe. Duh!
Oh no! What was I thinking? Not Booster. Destroyer! He would hang with Destroyer because he would be mentally challenging.
First published work:
"Hi, I'm Iron Man!"
"I'm a Marvel..."
Clearly Iron Man.
Then Nick Fury. Resources, getting the job done, similar view of how the world operates. Fury could be feeding him information in a manner reminiscent of Oracle, in Fury is much, much higher in the sky.
And clearly Morgan Freeman, because hey, he played God: he can be in any universe he likes!
I agree with malachaimanson and OpticNerve,Moonknight and Daredevil would be best buddy's(not the bloody Moonknight).My reason was because they're both Niteowls and so is The Dark Knight.
Evil Shall be Punished!!!!-Rorschach