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Boo (テレサ, Teresa) is a species of ghost enemy from the Mario series.
Boo appears as a trophy in Super Smash Bros. Melee.
Boo appears as a trophy in Super Smash Bros. Brawl, and also as a sticker. Boos also feature as background characters on the Luigi's Mansion stage, appearing briefly when part of the mansion is destroyed.
As a sticker
Boos debuted in Super Mario Bros. 3, and have been common enemies in the Mario games ever since. They often appear in Ghost Houses and other haunted places. They float in the air pursuing Mario and damage him on touch, but they stop when they're looked at, being too shy to move. In Luigi's Mansion, Boos serve a major role as enemies in the mansion, hence their stage cameo beginning in Brawl. In some Mario Kart games, Boos act as items that make the player invisible; this is likely the basis for their function as a Smash Tour item.
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