With Luigi’s Mansion, the youngest Mario brother became the most endearing

“Iconic”—that’s ultimately what the personality disparity comes down to. Mario is more icon than character. He’s a smiling mustache and a handful of jubilant yawps. His role is that of the archetypal cartoon hero, a goody-two-shoes Mickey Mouse in plumber’s clothing whose sole personality trait is an unflinching spirit that mirrors the determination of the player. And that’s okay. He doesn’t need to be anything more, nor should he be. But it also means that Mario isn’t afforded the room for expression that makes his brother’s turn in Luigi’s Mansion so charming and saves the game from becoming a shallow console-launch showpiece.

Whereas Mario would surely pull himself together after the occasional scare and return to his default state of courageously pushing ever-forward, his brother is a lovable cartoon coward through and through. He’s constantly humming along with the soundtrack in an admirable effort to calm his nerves. It never works. No amount of successful ghost-busting is enough to still his hands and unclench his teeth. Things can only go downhill for Luigi. As the mansion’s spirits beat him up, he goes from “mild case of the heebie-jeebies” to “shambling, terrified mess.” After enough abuse, he shrinks behind his flashlight into a jittering ball, and his cries for Mario—triggered at the press of a button—become shrill and quivering. But the descent might be most noticeable in his humming, which grows strained and erratic as his health declines:

Just like the entries in his diary, though, Luigi shows glints of confidence and pride that are soon overtaken by anxiety. When he collects a key or a novelty-sized gem stone, he holds it up and mugs for the camera with a wild grin before shoving it into his infinite overalls pocket so he may resume cowering. He even sneaks in some cheesy jokes and musings if you ask him to inspect the mansion’s furnishings. “Looks like a fun place to make shadow puppets,” he says to an old film projector.

The offbeat details like that shadow puppets line get to the heart of Luigi’s appeal. He’s not a traditional hero like his brother. He’s a goofball. Luigi doesn’t walk; he slinks on his tippy toes with his arms out to the side because, surely, the poltergeists that litter the mansion’s hallways won’t hear him coming that way. When he runs, he gyrates his arms like a kid pretending to be a choo-choo train. Even when he has a video chat with Professor E. Gadd, inventor extraordinaire and Luigi’s phantom-fighting guide, Luigi can’t resist playing with his Game Boy Horror communicator. He pokes at the buttons, wide-eyed and agape. Just look at him. He probably isn’t even listening to a damn thing E. Gadd is saying. The professor never should have programmed Snake onto that thing.

But you know Mario would have hung on E. Gadd’s every word. Mario would have listened and nodded along. He’d sign off with a thumbs-up and an “mm-hm!” and be off yet again, an empty vessel with nothing but a mission in his mind and fire in his heart. Steadfast heroism has its place, but when it comes to making an emotional connection with the player, it can’t replace weakness and honesty. Mario might get all the glory, Luigi, but you’ve got the heart.