Samus: 'Hey, is Marth a guy or a girl?
Sonic: 'Huh... he looks quite girly...'
Link: 'Actually, he's a guy.'
Pit: 'How is she a guy? Seriously, look at the proportions!'
Snake: 'GTF away from my box.'
Marth (thought): Urge to kill... rising...
^
(Quoted from the picture's creator)
LOL
Marth will most likely kill Samus, Pit (most definitely) & Sonic (Oddly enough my three most used characters in Brawl... :p)... Not Link for the fact of acknowledging him as a guy. Unknown about Snake...