The Fan can be swung so rapidly that it leaves opponents unable to counterattack. It is, however, an exceedingly weak weapon. Despite this shortcoming, the Fan is quite effective as a shield breaker, and it works well at disrupting an enemy's equilibrium. Throw the fan to send your foe bouncing straight up into the sky.
An item made by taking thick paper, folding it accordion-style, taping one end, and fanning out the other. It's mainly used as a comedic prop by comedians from Osaka and the Kansai region of Japan. Why it's in Smash Bros. is a mystery. Grab this unique item and whack foes to turn them in the opposite direction. Throw a fan at a foe, and that character will fly straight up.
The Fan appears as an item in Mario Kart Arcade GP.
The Fan is effectively abused by smaller characters, due to the their size. The Fan serves as an extension of the characters body, lengthening the range, and eventually, inviting 1 or 2 foes into the area of effect of the Fan. The speed is also abused because it can effectively cancel out the foe's oppurtunity to escape.
The Fan is an incredibly effective item in Multi-Man Melee and Brawl when thrown, as it will always KO the enemy when hit and will bounce back into the air, often starting a chain of opponents being KO'd by the flying Fan.
While the trophy description of the Fan in Brawl says that it can turn foes around, it has no such effect in-game.