When he needs a copilot to throw Koopa shells at DK and his cronies—yep, it's Luigi.
Luigi, of course! But we would like to point out that, if there's one case to be made in favor, it likely has something to do with Mario's taller, goofier, more awkward brother in green. If you're interested in a thoroughly helpful role outside of the limelight, we would definitely suggest this Luigi Adult Hat and Mustache.Super Mario Bros.