Luigi Mario is the youngest of the 2. He spouts amazing amounts of attacks. He can run faster and jump higher then Mario. But due to his proness to fear and being quite shy, he isn't really great on adventuring. Many people think that it means Luigi is jealous of Mario, but that's not true. Luigi enjoys taking small jobs like cleaning the house and ACTUAL plumbing jobs.
"Hey Luigi, Can you handle the plumbing jobs that come from when I leave? I'm gonna sign autographs."