“HEY! Are YOU lookin' at me? My hammer and I don't like you! Now ya got my hammer angry! Ya shouldn't have done that!” —Hammer Bro., [[Super Mario RPG:Legend of the Seven Stars
Hammer Bros. (Also called Hammer Brothers; called Hammer Bros in Paper Mario: The Thousand-Year Door, Mario Party 8, Mario Party DS, Mario Super Sluggers, and Super Smash Bros. Brawl), are a species of Koopa that stand upright and throw hammers at passers-by. They have been around since Super Mario Bros. They have bigger shells than normal Koopas and wear headgear, most likely to protect themselves from their hammers. They can also use special hammers to shrink their enemies. Hammer Bros. have many times been described as the most elite fighters in Bowser's Koopa Troop. These enemies were originally designed by Kazuaki Morita.[1]