Luigi

Luigi is the younger brother of Mario and the secondary protagonist of the Mario series. Though he is cowardly and clumsy, he is also sweet, loving, and strong, and will muster up enough courage to help his brother in battles.

Mario and Sonic: Worlds in Danger
Luigi appears as one of the main heroes in Jmkrebs30's Flash series Mario and Sonic Worlds In Danger, alongside Miles "Tails" Prower. He, along with Mario, Sonic, Tails and others will go on to search for the Chaos Emeralds and Crystal Stars and to defeat Bowser and Dr. Eggman from bringing the Mushroom World and Mobius together.