Is there are reason why Mario and Luigi are red and green?

Yes there is a reason. Mario as あなた know is the short, brave, older, heroic brother and Luigi is the tall, younger, cowardly, shy brother. They would be considered polar opposites. If u have a color wheel または have studied it in Art または sumthin, then あなた would know that red is straight across from green therefore red and green are opposite colors. Though i like Luigi better...

I might of thought because since they're Italian, green, red and white are the Colors（色） of the flag of Italy. Mario red, Luigi green and when both of them use the 花 to shoot 火災, 火 balls they're white. plus they have Italian names too.

what i heard is that the people who though of mario and luigi,there fav Colors（色） were red and green so they made mario and luigi those colors.

Mario is red because it contrasts the background nicely. Luigi is green because green is opposite of red, and still has a good contrast against the background.

i think because of an opposite colors