Fans are enemies introduced in Gradius, notable for being the first enemy to be encountered. They are also the most common enemy in the game.
Fans fly in groups of five to nine, following beyond each other in a line trail. They appear high or low on the screen, and then will move one row closer to the Vic Viper, then continue off the screen. If the entire row of Fans are destroyed, the last one will leave a capsule.