Luigi

Luigi is portrayed as a cautious, clumsy, self-conscious, and timid person who is especially afraid of ghosts, but like his brother Mario, he is kind-hearted and heroic. He becomes easily startled and hates dangerous situations, but overcomes his fears and acts like a hero when necessary, such as when someone or his homeland is in danger or needs help.

The above text is from the Super Mario Wiki and is available under a Creative Commons license. Attribution must be provided through a list of authors or a link back to the original article. Source: https://www.mariowiki.com/Luigi