Mario and Luigi will ever get married?

I don't think so.
If they get married, probably they would stop going to adventures.

Luigi sure Mario nahh cause when peach is walkin down the isle Mario will blink open his eye and see hey ass (Sorry for lango) get kidnapped AGAIN
so if you ask me Peach with Marios ring on her finger impossible until
A.Mario Kills Bowser
or
B.Nintendo stops Mario games (NEEEVVVER)

Okay if you mean to each other, all I have to say to that is ew, they're brothers.

If you mean separately to other girls then why not. It would be cute.

Want people to call Mario "Pedo-Mario" and Luigi "Gay-Luigi"?

Not to each other, but maybe to Peach and Daisy

Never. The Super Mario Brothers are staying cool and single forever! Like Me! :-)! Taking care of business, helping doing away with evil. - Making the world a better, more beautiful place. <3. XOXO. :).

You gotta be kiddin' me.

arnt they all ready married to peach and dasiy