I think that all of them but I think Petey Piranha and king boo cause there really cool enemy's

Well, the combination of characters together is almost endless. I personally liked Baby Bowser and Diddy Kong together. But if I have to choose from that list, it would be Koopa Troopa and Paratroopa.

I use the Bowsers. But my family is terrible at this game so I can win with anything.

When me and ryaN raced against the computer we used koopa and i used donkey kong ^_^.

But when i played myself it was mini mario and mini luigi.

I alays used luigi and baby mario :D

I use Mario and Luigi.

From the combinations there, I'd have to go for the Koopa duo. But I have been using a combination of Bowser Jr. and Paratroopa whenever I've played the game recently.