Batman
Batman is Mario's greatest rival. He first competed in the 1947 Spring Olympics in the Milk Drinking Competition and lost. Ever since then, he's stated that he will "beat Mario at milk drinking once and for all" some day.
History of milk-drinking
Ever since his parents died, Batman has drinky the milk to make his bones big and strong. That is why he is so burly! He drinky milk get so big strong man!
Rapping career
In spite of his great efforts to become the world's greatest milk drinker, his most impactful talent is his rapping ability. He has won every rap battle.
Fistfighting ability
Has yet to beat his rival, Mario, in a fistfight. We will see if this changes in the future.