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The cowardice Luigi tends to display really does depend on the game he appears in. During, for example, Luigi's Mansion, he appears deathly afraid of the ghosts that haunt the mansion, but it does make sense to be afraid of them, seeing as...well, they're ghosts. In addition, he was still brave enough to journey through the mansion in order to save his brother. This is somewhat contrasted by his portayal in games like Super Paper Mario, where he is bold enough to attack Count Bleck and the Chaos Heart, embarks on a journey with Mario and co. in order to save all worlds from destruction, and even resolves to stay and battle Dimentio on his own, giving Mario time to hurry ahead. ~~~~