Tweeter is a bird-appearing hybrid of a Shy Guy residing in Subcon.
Super Mario series
Yume Kōjō: Doki Doki Panic/Super Mario Bros. 2
Tweeter first appears in Yume Kōjō: Doki Doki Panic and later in its western remake Super Mario Bros. 2. This foes does not attack in a hazardous way. Instead, it makes small hops in the area and cannot fly, similar to certain types of Paragoombas. In Super Mario All-Stars, its red color was recolored to pink.
Super Mario World 2: Yoshi's Island
Tweeter was going to appear in Super Mario World 2: Yoshi's Island as an enemy, but has been scrapped from the game for reasons unknown.
Mario Kart series
Mario Kart: Super Circuit
Tweeter makes a cameo appearance in Mario Kart: Super Circuit. In this game, he can be seen on a totem pole. He has been redesigned to look more modern, such as how a Shy Guy and Snifit does.