Boo Amiibo

Boo is a small white ghost who is too shy to attack you while you're looking at him. Boos debuted in Super Mario Bros. 3 (1988 NES), where the gimmick was that they'd freeze in place when Mario faced them and pursue him aggressively the moment he turned his back.

Tap him on compatible games for a Boo Mystery Mushroom in Super Mario Maker and small bonus content elsewhere.

The figure: small white ghost-body, two stubby arms, the embarrassed-Boo expression Boos make when Mario isn't looking.

He pairs with the Mario antagonist subcluster and the Luigi's Mansion subcluster. His entire design is built on a paradox: too shy to fight you when you're watching, extremely aggressive the moment you turn around. The franchise's only enemy whose mechanics are based on social anxiety. Don't turn your back on him.