Luigi is Mario's younger, taller, better, thinner twin brother. He is a major protagonist of the Mario series. Luigi has helped and fought alongside his brother on many occasions. Throughout his life, he has lived in Mario's shadow, developing both cowardly and heroic tendencies. Luigi has gained his own identity and personality since his humble beginnings, noticeably in his hit series Luigi's Mansion, as well as the Mario & Luigi series.
First: Favorite Underrated Character
